Spatial Mobility of Knowledge: Communicating Different Categories of Knowledge

The recurring erroneous predictions about the impact of communication technologies on the spatial distribution and “mobility” of codified knowledge, and most deficits in research about knowledge spillovers (knowledge flows) and about knowledge sharing can be traced back to an oversimplification of the communication process between producers of knowledge and recipients of information, a missing distinction between knowledge and information, and insufficient categorization of the various types and grades of knowledge. This paper focuses primarily on the communication process between two individuals: a communicator and a recipient of information and is interested in the reasons why communication of knowledge may fail. An extended and more realistic communicator-recipient model is the cornerstone of any research about the “mobility of knowledge”. The author discusses assumptions leading to erroneous conclusions about the mobility of knowledge and then proposes a likely more adequate model of communication.

mobility of higher grades of knowledge is so selective in the spatial dimension; and which factors, interventions, language barriers, and psychological processes prevent, impede, or modify the communication process between the sources of knowledge and the recipients of information.
In order to avoid misunderstandings about the mobility of knowledge, it is necessary to distinguish different categories of knowledge transfer, such as the mobility of persons; knowledge exchange between scholars; knowledge transfer where the use of knowledge is regulated by contracts, formal technology-transfer agreements, intellectual property rights or bureaucratic instructions; processes of exploration in which indigenous knowledge was absorbed into European systems of knowledge and intermediaries such as guides, brokers, explorers, and interpreters played a significant role in the process of translation (Gregory, 2000; see chapter by Driver in this volume). Premediated knowledge exchange and knowledge exchange bound by contract have to be distinguished from unintended and discretionary knowledge transfer. Figure 2.1 shows two diametrically opposed categories of the spatial dissemination of knowledge: Collaborative knowledge sharing between cooperating economic agents in which case the owner of knowledge has an exclusive right to exploit that substantive knowledge for monetary profit and is willing to sell it; and discretionary knowledge dissemination in which case it is not clear from the outset who will be able and willing to absorb and use the publically available knowledge. Collaborative knowledge sharing within organizations or between cooperating units of different social systems and the role of spatial, cognitive, organizational, and institutional proximity (for details see James, Vissers, Larsson, & Dahlström, 2016;Tsai, 2001;Vissers & Dankbaar, 2016) are only part of the story. Therefore, research results about collaborative knowledge sharing should not be seen as universally applicable; they represent cases of knowledge transfer that are relatively straightforward and easily described. The most unambiguous and traceable transfers of knowledge are those in which someone has an exclusive right to exploit his or her substantive knowledge 2 (in this case a private good) for monetary profit (Crevoisier, 2016, pp. 191-192) and is willing to sell it. In such cases "a precise description of the content of knowledge is a prerequisite for its mobility" (Crevoisier, 2016, p. 195), and the use of the knowledge is regulated by contracts, formal technology transfer-agreements, or intellectual property rights. Economic actors will only pay for patents or intellectual property rights if they fully understand the contents of the knowledge and are convinced of its usefulness and value. Discretionary knowledge dissemination is a much more complex communication process. Caught in a crossfire of influences, it seems to be a greater scientific challenge from a geographer's point of view than collaborative knowledge sharing.
Summing up, communication processes of certain categories of knowledge may encounter a lot of impediments, misunderstandings, resistance, contingencies, and

Collaborative Knowledge Sharing
The owner of the knowledge has an exclusive right to exploit that substantive knowledge for monetary profit and is willing to sell it.
The communication of the knowledge is easy. The owner and buyer of knowledge have a comparable level of prior knowledge and expertise. Economic actors will only pay for patents or intellectual property rights if they fully understand the contents of the knowledge and are convinced of its usefulness and value.

Discretionary Knowledge Dissemination
The owner or communicator of the knowledge has no exclusive right to exploit that knowledge.
This category of knowledge transfer is difficult to trace.
The use of the knowledge is regulated by contracts, formal technology-transfer agreements, intellectual property rights or bureaucratic instructions.
The knowledge is publicly available. Its distribution is not restricted by contracts or regulations. It is not clear from the outset who will absorb and use the knowledge. The owner or communicator of the knowledge has no influence on how that knowledge is used by others or on the way it is interpreted elsewhere.
The grade of knowledge available for transfer and the absorptive capacities and will of the potential receptors determine the spatial distribution of knowledge. Knowledge dissemination will fail in many cases, because the potential addressees of information or the users of that knowledge might not have the language skills, expertise, prior knowledge and cognitive capacities necessary to understand, evaluate, and use the available information.
Knowledge sharing between cooperating economic agents is unambiguous and traceable. pitfalls. 3 In order to avoid misunderstandings and inadequate generalizations, scholars should specify more clearly which categories of knowledge they are talking about and between whom, for which purpose, and under which external conditions the knowledge in question is communicated. So-called low grade, routine knowledge (e.g., the result of a soccer match or the price of a good) can be spread globally in seconds. Other categories of knowledge are place-based or bound to particular contexts; they will remain local or indigenous knowledge and will never (or seldom) be transferred to different (social) environments (for details see Antweiler, 2016;Nüsser & Baghel, 2016;Senft, 2016;Sillitoe, 2016). Some contents of knowledge will be kept secret as long as possible or necessary. Another group of knowledge categories such as scientific knowledge or specialized professional knowledge will only be understood, applied, accepted, or replicated at a small number of places where experienced and knowledgeable experts or "absorptive capacities" (Cohen & Levinthal, 1990) are available.
In this chapter I focus on the questions of why the communication process between a source of knowledge and potential receivers of information may fail or be delayed; why the dissemination of high grade knowledge is so selective, and why many agents (social systems) fail in their evaluation of which kind of knowledge might become valuable for them. In the first part, I discuss some of the assumptions and premises that are often leading to narrow conclusions about the mobility of knowledge. In the second section I propose a likely more adequate and more realistic communicator-recipient model that focuses especially on the steps in which the communication process between two agents may fail because part of the information is withheld, not understood, distorted, or rejected as untrue or useless.
Within a thick network "which is supported by close social interactions and by institutions building trust and encouraging informal relations among actors" (Huber, 2012, p. 110; see also Breschi & Malerba, 2001, pp. 819-820) and within an epistemic community whose members command a comparable level of prior knowledge and expertise, communication of knowledge and local learning processes seem to be comparatively unproblematic.
It is a popular idea that firms located in clusters benefit from local knowledge spillovers: knowledge created by a local agent can be accessed and used by other agents without market interaction and financial compensation for the producer of the knowledge. (Huber, 2012, p. 108) The basic idea of knowledge spin-offs or spillover is "that the creation of new knowledge by one firm has positive external effects on the knowledge production activities of other firms, either because knowledge cannot be kept secret, or because patents do not guarantee full protection from imitation" (Karlsson & Manduchi, 2001, p. 110). Fischer (2001) speaks of knowledge spillovers when "knowledge created by one firm can be used by another without compensation or with compensation less than the value of the knowledge" (p. 204). In the last couple of years, an increasing number of authors found that "in an innovative technology cluster local knowledge spillovers and territorial learning might not be as widespread as the literature tends to suggest" (Huber, 2012, p. 114; see also the critiques of Breschi & Lissoni, 2001a, b;Breschi & Malerba, 2001;Foss et al., 2010;Karlsson & Manduchi, 2001). Communication and dissemination of particular scientific or technical knowledge will only be successful when the source of knowledge and the recipient of information have a comparable level of prior knowledge and expertise, when they speak a common language, 5 and share common goals, interests, and "thought styles" (in the sense of Fleck, 1935Fleck, /1979; see also Trenn & Merton, 1979, p. 159). In reality, agents and firms differ greatly in their knowledge and expertise, their ability to learn, their competence to interpret signs and data, and their inventiveness.
overs exist whenever there are knowledge spillovers between contributors who are not directly connected" (p. 77). 5 According to Gadamer, "human being…is a being in language. It is through language that the world is opened up for us. We learn to know the world by learning to master a language" (as paraphrased in Ramberg & Gjesdal, 2005/2014).
The assumption that new and valuable knowledge will be taken up with benevolence or great enthusiasm is naïve. Even within the same epistemic community, new knowledge is not disseminated inherently; it may be criticized, rejected, or just ignored. Studies on the history of science offer many examples showing that it may take years or decades for path-breaking new paradigms and seminal new research results to be taken up by other scholars of the same research field, let alone those of neighboring disciplines. An easy access to globally available scientific publications is not at all tantamount to the mobility of the knowledge presented in those publications. This refers not only to the humanities and social sciences, sometimes called "fragmented adhocracies" (Whitley, 1984a, p. 776;Whitley, 1984b, p. 34; see also Froese & Mevissen, 2016, pp. 35-37) that tend "to produce rather diffuse and broad contributions to general intellectual problems which are subject to contrasting interpretations and evaluations" (Whitley, 1984b, p. 36), but also to the hard sciences. The so-called Semmelweis reflex-a metaphor for the reflex-like tendency to reject new theories, new methods, new research questions or new knowledge because they contradict dominant paradigms, established norms or beliefs-is also widespread in the sciences. 6 Research on the mobility of knowledge should focus more on the complexity of communication processes. Scholars should ask why pathbreaking new research results or technical inventions may be ignored, contested, and declined for long periods of time in spite of their great medical, technical, or economic usefulness. They should also pay more attention to the fact that in a competitive world there are many situations in which agents and organizations need to acquire external knowledge that is not voluntarily offered or shared by others. In such cases, agents need 6 A number of famous scientists had the impression of coming up against a brick wall when they first published their outstanding scientific results. It took more than 30 years for the significance of Gregor Mendel's (1822-1884) genetics to be recognized. The pathbreaking findings of Ignaz Semmelweis (1818-1865) about childbed fever (published in 1847 and 1848) were repudiated by professors of medicine until the late 1860s. Alfred Wegener's (1880-1930) theory of continental drift (1912) continued to be attacked by his colleagues until the early 1960s. Even Nobel Prize winners had to wait for many years until their research gained the recognition of their colleagues. Physiologist Albrecht Kossel (1863Kossel ( -1927 was one of three Heidelberg physiologists who established biochemistry as a key subject of the life sciences. Kossel was awarded the Nobel Prize in Medicine in 1910 for his contributions to knowledge about the "chemistry of the cell nucleus". His research laid the foundation for biochemistry and molecular biology and was unique in its effect on the development of the life sciences. Efforts to make biochemistry an independent discipline at Heidelberg University were continually interrupted not only by outside circumstances (World War I and II) but also by dissent from the professors inside the fields of chemistry and medicine. It was not until 1961 that the first full professor of physiological chemistry was appointed at Heidelberg university (Schafmeier, Franke-Schaub, Schirmer, & Brunner, 2012, p. 223). Harald zur Hausen (born 1936), Heidelberg's Nobel Prize winner in medicine in 2008 (for details see Mager, 2012) started his seminal research about human papillomavirus 6 in 1972. In 1976, he published the hypothesis that human papillomavirus plays an important role in the cause of cervical cancer. His work on papillomaviruses and cervical cancer received a great deal of scientific criticism, and sparked a major scientific controversy with other scientists favoring herpes simplex as a cause for cervical cancer. It took some 10 years for zur Hausen's research results to become widely accepted by his colleagues (https://en.wikipedia.org/wiki/Harald_zur_Hausen). the cognitive capacity and experience to interpret data, signs, and patterns; to anticipate grassroots developments; to draw conclusions from incomplete information; to disclose secrets; to evaluate the potential of new ideas; to foresee new markets; to invent new techniques; and to explore unknown grounds by crossing disciplinary borders.

The Impact of New Information and Communication Technologies on the Mobility of Knowledge
Some of the problematic assumptions about the mobility of knowledge can be traced back to the opinion that the social and economic impacts of new communication technologies are clear and unambiguous, that various means of telecommunication will substantially reduce the amount of face-to-face contacts and therefore diminish the role of centers. This misjudgment has a long history. At the end of nineteenth century, the Bell Company advertised the telephone with the argument that it would decrease the need for business travel because many discussions, negotiations, and decisions would no longer need face-to-face contacts. It was expected that power and decision making could be more decentralized and cities would lose part of their location advantages. However, the Bell Company was one of the first to centralize its decision making after introducing the phone. 7 Similar forecasts were made after the introduction of the Internet and other electronic communication. Some observers (Cairncross, 1997;Knoke, 1996;Naisbitt, 1982;Negroponte, 1995;Relph, 1976;Toffler, 1980) went as far as to predict that advances in electronic communication would lead to an almost unbounded mobility of knowledge. Anyone using the Internet would have access to the knowledge he or she needed. Others criticized this theoretical position as early as the 1970s and 1980s (Short, Williams, & Christie, 1976;Meusburger, 1980, pp. 105-107). They argued that new information technologies would primarily facilitate access to freely offered, easily understandable information but not replace the need for face-to-face contacts among high-level decisions makers. Almost any proliferation of new communication devices increased the division of labor, promoted further differentiation of complex social systems, and made some aspects of face-to-face contacts dispensable-although it simultaneously created a large new demand for them.
Many new means of communication (script, paper, printing machine, telephone, Internet, and so on) benefited in the first phase of their dissemination primarily those in power and created new inequalities concerning the access to knowledge (see chapter by Bloor in this book). New telecommunication technologies also contributed to the spatial bifurcation of skills; to a further spatial concentration of workplaces affiliated with high-level decision making in regional, national, and global centers 8 ; and to a decentralization of routine activities in low-cost peripheries (Meusburger, 1980(Meusburger, , 1998(Meusburger, , 2000(Meusburger, , 2008Meusburger, Koch, & Christmann, 2011).
It is true that communication devices improved access to information; they changed the structure, size, and complexity of organizations and the ways in which social systems and networks were coordinated and governed in space. But none of these inventions ever abolished the spatial concentration of power or central-peripheral disparities pertaining to the production, dissemination, and use of high-level knowledge. On the contrary, the knowledge gap between better and less educated segments of society (Tichenor, Donohue, & Olien, 1970) and the research gap between the global centers and peripheries increased. Studies about the spatial distribution of Nobel Prize winners (Mager, 2012) or about worldwide scientific collaborations of research centers (see Raditsch, 2012, p. 289;Seltmann, 2012, p. 284) belong to the most convincing evidence for the selectivity of knowledge exchange.
When it comes to the mobility of high-grade knowledge, some authors seem to focus too much on the technically imaginable and to overlook relations between power and knowledge; asymmetric power relations between top and base or center and periphery of a social system; and spatial disparities of literacy, educational achievement, and international reputation of research. They underestimate emotional and psychological aspects of communication, the role of mutual trust, the symbolic meaning of places, and the importance of nonverbal communication. What is possible from a technical point of view (e.g., decentralization of decision making in social systems) may not be feasible because of human preferences and psychological processes.
When asking in which situations communication technologies may replace faceto-face contacts, it is necessary to distinguish between different categories of contacts, for example, between orientation contacts, planning contacts, and routine contacts; between internal (within the social system) and external contacts (with other social systems); and between face-to-face contacts and indirect contacts (via letter, phone, email, etc.). This was already being emphasized in the 1970s and early 1980s by Goddard (1971), Goddard and Morris (1976), Goddard and Pye (1977), and others. However, most of these categorical distinctions seem to be neglected nowadays.
The importance of face-to-face contacts and the possibility of replacing them with indirect contacts (e.g., letters, phone, emails) depend on the type and grade of knowledge (information) that has to be transferred from A to B, on the relations between the persons communicating with each other (cooperation or competition, trust or distrust, friend or stranger), on the degree of uncertainty a person or social system is exposed to in the external environment, and on many other issues discussed in organization theory and human geography (for details see Bathelt & Glückler, 2011;Goddard, 1971;Goddard & Morris, 1976;Goddard & Pye, 1977;Mintzberg, 1979;Storper & Venables, 2004).
There is no doubt that digital information systems provide new opportunities for the internal sharing and joint utilization of voluntarily offered, easily understandable information, especially within organizations or supply chains, between a headquarters and its spatially dispersed production and customer bases. Communication partners who trust each other and have a long history of successful cooperation will exchange most of their routine information by indirect contacts. However, indirect contacts are seldom used when the degree of uncertainty and risk is high and the degree of mutual trust still low; when communication has to be kept secret; or when hazardous cooperation has to be cautiously prepared. Motivation, mutual trust, and persuasion 9 are easier achieved by face-to-face contacts than by letters or other forms of indirect communication.
A large part of information needed for crucial decision making in risky situations is not stored in databases and not shared via phone or email but is predominantly acquired via face-to-face contacts between highly experienced experts and top decision-makers of different organizations. In such situations nonverbal communication, careful observation of facial expressions of conversational partners, and interpretation of signs and patterns in the environment become very important. However, by the time agents or units of different social systems have come to trust each other and are cooperating well, or the processes of research, design, and production are ready to be formalized and standardized, many face-to-face contacts have become routine and replaceable with electronic communication.

Is Codified Knowledge a Public Good and a Tradable Commodity? The Necessity to Distinguish Between Knowledge and Information
For many years, economists regarded codified knowledge as a public good and a tradable commodity. This premise is almost inalienable to neoclassical economic theory, but highly questionable. Knowledge is only a public good-in the economic sense-if it can be used without additional costs. Knowledge is only tradable if possible recipients are able to understand and use the offered information. "[A]chieving understanding is the initial step in a transfer process that ends when the recipient is able to use the shared knowledge in his or her area of expertise or domain" (Tortoriello, Reagans, & McEvily, 2012, pp. 1025-1026. Scholars supporting the assumption that knowledge is a tradable commodity should not forget to mention the number of persons who are able to take advantage of a particular kind of knowledge. It makes a difference whether a scientific publication is understood by 100, 10,000, or 500 million people and whether these persons are randomly distributed in space or concentrated in a few places (e.g., research laboratories).
The premise that codified knowledge is a public good and a tradable commodity is justified by two arguments. Some economists argue that new knowledge cannot be kept secret and becomes public in the long term. However, this argument overlooks the fact that in highly competitive situations, success or failure in achieving a certain goal does not depend on knowledge or information per se but on a short lead in knowledge, on receiving information, acquiring skills, or installing new technologies earlier than competitors. 10 In most cases it is the earlier availability of specialized, unique, or rare knowledge that makes one social system, institution, or region more successful than the other (for details see Liebeskind, 1996, p. 98;Meusburger, 2013, p. 37).
The second argument used by economists to defend their premise is that knowledge and information are more or less the same, that a large part of knowledge can be codified, and that codified knowledge can almost completely be transformed into information easily transferable to other agents (a detailed discussion is provided by Ancori, Bureth, & Cohendet, 2000, p. 256;Cowan, David, & Foray, 2000, p. 221;Spinner, 1994). Ancori et al. (2000) explained why the codification of knowledge is a major concern of economists and why they find it difficult to give up their claim that there is (almost) no difference between codified knowledge and information. To be treated as an economic good with discernible and measurable characteristics, knowledge must be put into a form that can be exchanged, and that form is information. This view has been challenged not only by work in sociology of science (Callon et al., 1999;Collins, 1983), geography of knowledge (Livingstone, 1995(Livingstone, , 2000(Livingstone, , 2002(Livingstone, , 2003Meusburger, 1998Meusburger, , 2008, philosophy (Abel, 2004;Gadamer, 1960Gadamer, /1999, and communication theory but also by some economists (Amin & Cohendet, 2004;Ancori et al., 2000). Cohendet and Steinmüller (2001) present a number of arguments why a clear distinction between knowledge and information is indispensable.
The fact that codified knowledge is made public or available for free does not mean that it is understood, accepted, or used by all those who have access to the information and could profit from it. The quality and accuracy of codifying knowledge or the accessibility of information is only one side of the coin. The other side concerns the cognitive abilities, goals, interests, motivation, attention, emotions, ideology, and prejudices of the (potential) recipients of information and the milieus they are embedded in. 11 It should not be taken for granted that all the potential receivers have the cognitive capacity and willingness to use the available information to their benefit. If information is published in Chinese characters, Gujarati, or cuneiform script, billions of people having access to this information via the Internet will not be able to read it. A certain type or content of knowledge may be perfectly codified in equations, published in international journals, and well understood by 50 to 100 theoretical physicists, but the rest of the world population may just not have acquired the prior knowledge 12 necessary to read and understand the mathematical equations and to integrate this new information in their own knowledge base.
This discrepancy between knowledge and information can be demonstrated by Fig. 2.2. This paragraph is taken from a paper published in an important international journal available on the Internet, where billions of people have access to it. It uses two codes-the English language and mathematical formulas. English is the most widespread language in the world, and although the mathematical formulas may be understood by less people, they can be learned in a reasonable amount of time. However, the mastery of these two codes does not mean that readers will be able to understand the message presented in this information and to integrate it into their knowledge base. They can only understand the offered information if they have studied and gathered research experience in special fields of theoretical physics. One needs prior knowledge to understand the information offered in Fig. 2.2.
From the viewpoint of the producer (source) of new knowledge, the boundary between information and knowledge might become blurred. With regard to the recipient of a message, the difference between knowledge and information becomes quite distinct. As soon as the communication process occurs between two individu-12 The term Vorwissen (here translated as prior knowledge) draws on Gadamer's (1960Gadamer's ( /1999 term Vorverständnis (prior understanding).
For Lorentzian (2+1)-gravity with vanishing cosmological constant, each element λ ∈ π 1 (M) is associated with two canonical Wilson loop observables which are the fundamental physical observables of the theory. It is shown in [16,17]  It has been shown that the mass and spin observables associated with all elements of the fundamental group π 1 (S g ) ∼ = form a complete set of observables. Their values determine the spacetime uniquely and they parametrize the physical phase space (2.27) of the theory.

Fig. 2.2
The ability to read an information does not mean to understand it (Source of the text: Meusburger, C., 2009, p. 11) als, the distinction between knowledge and information becomes indispensable.
Receiving information is in many cases not equivalent with gaining knowledge. The higher the grade of knowledge, the clearer the discrepancy between knowledge and information becomes from the viewpoint of the receivers of information. Making information available is not tantamount to disseminating knowledge. A scientific publication may be available worldwide and free of charge, but the proportion of the population being able to understand the semantic meaning of the information may be less than one per million. Knowledge does not move from A to B if people at place B do not understand the information offered to them. Therefore, I question the assumption shared by Fujita, Krugman, and Venables (1999), Maskell and Malmberg (1999), and many others that the more codified or the more public the knowledge involved, the more mobile it is and that knowledge, once codified, is almost instantly available to all firms at zero cost regardless of their location. Their assumption is only valid for easily understandable information that has little value in economic competition.

Nominal and Ordinal Differentiations of Knowledge
Metaphors such as knowledge spillovers or knowledge flows are misleading for various reasons. They suggest that codified knowledge or information disseminate like a liquid once they are no longer secret. Liquids spilling out of a bowl or flowing on a plain affect first the proximate and finally the distant agents. Most categories of knowledge do not follow a linear diffusion model as the liquid metaphor suggests.
In order to avoid misunderstandings, studies on the mobility of knowledge should always specify which categories of knowledge are being addressed. Knowledge embodied in people has to be distinguished from knowledge presented in publications and knowledge integrated in machines. Knowledge sharing within organizations or between cooperating units should be distinguished from knowledge acquisition in a risky and competitive external environment. Codified routine knowledge storable in databases has to be distinguished from intuition, foresight, and competence based on years of experience and learning. Knowledge exchange between experts in the same domain (e.g., between the owner and user of a patent or between two molecular biologists doing research about the same topic) has to be discerned from communication between expert and layperson.
Most categorizations of knowledge used so far-for example, the distinctions between codified and tacit knowledge; explicit and implicit knowledge; analytical, synthetic, and symbolic knowledge (Asheim, 2007); factual knowledge 13 and orien-13 Factual knowledge is needed in order to analyze a situation as precisely as possible and to offer solutions to technical or scientific problems. Depending on the task to be solved, it may consist of scientific knowledge, domain-specific expertise, professional skills, familiarity with codes (foreign languages, mathematical equations) and theoretical concepts, or various cognitive abilities, such as the skills of perceiving problems earlier than others or evaluating situations in a more realistic way tation knowledge 14 (Meusburger, 2015a); or between substantive and significant knowledge (Crevoisier, 2016)-are nominal distinctions. Some of these distinctions-those between codified and tacit or implicit 15 and explicit knowledge-are quite problematic. What is implicit knowledge for one person or at one point in time can be perfectly explicit for another person or at some other time. It is not possible to draw a generally valid line between tacit and codified knowledge. Some authors view codified and tacit knowledge as essentially complementary because all forms of codified knowledge require tacit knowledge to be useful (Ancori et al., 2000, p. 257). Knowledge may remain tacit just because the source and recipient have no skills of how to codify a specific sort of knowledge (Ancori et al., 2000, pp. 273-274;Baumard, 1999;Collins, 2001).
In spite of the fact that the concept of tacit knowledge is widely discussed (see Ancori et al., 2000;Baumard, 1999;Collins, 2001;Cowan et al., 2000;Gertler, 2003;Lam, 2000;Polanyi, 1967;Reber, 1993), "the terminology and meaning of 'tacitness' in the economics literature [have] drifted far from its original epistemological and psychological moorings [and have] become unproductively amorphous" (Cowan et al., 2000, p. 213). Some authors use the concept of tacit knowledge as a kind of umbrella term for nonverbal knowledge that cannot be articulated by using linguistic expressions (e.g., the competence to play violin or to ski) and nonpropositional knowledge (e.g., knowing how to understand a bodily movement). 16 In summary, "The concept…of knowledge tacitness has been stretched too far for being still useful" (Breschi & Lissoni, 2001b, p. 262).
In addition to nominal categorizations of knowledge, ordinal categorizations of knowledge 17 focusing on different grades of knowledge are needed as well. It has already been mentioned that certain types of information can only be read and than others. Factual knowledge searches for and relies on a kind of truth that can be empirically tested and rejected. 14 Orientation knowledge provides a point of moral reference; it declares what is good or evil, right and wrong. It may consist of, for example, religious and ideological convictions, prejudices and stereotypes, national myths, political legends, loyalty to a community, or cultural traditions. Orientation knowledge creates collective memories and sustains the internal cohesion and motivation of a social system; it mobilizes loyalty.
With regard to the individual actor, it is evident that there is no clear boundary between factual and orientation knowledge. Both knowledge systems intermingle with each other. However, on the level of large and complex organizations, a clear functional differentiation between factual knowledge and orientation knowledge can be observed. Experts of factual knowledge have other tasks, need different training and skills, and use other methods than experts of orientation knowledge do (for details see Meusburger, 2015a). 15 According to the philosopher Abel (2004), "tacit knowledge means those aspects of knowing that are implicit in situations of perceiving, speaking, thinking and acting, but are not made explicit, are not disclosed at surface" (p. 322). 16 A number of authors argue, ironically, that the meaning and functioning of tacit knowledge usually remains tacit (Martin & Sunley, 2003, p. 17;Huber, 2012, p. 109). 17 Another example of an ordinal categorization of knowledge has been presented by Willke (1998, p. 172) who discriminated between "simple knowledge" (observations of first order) and "reflexive knowledge" (observations of second order). understood by people having a certain degree of prior knowledge at their disposal. The acquisition of this prior knowledge may take days, months, or many years and is associated with costs. 18 Prior knowledge may refer to learning a foreign language, graduating in a scientific discipline, doing research about a specific topic for many years, gaining experience in a profession or community of practice for more than 10 years, improving one's cognitive skills and creativity, or just become literate.
It is possible to categorize knowledge in an ordinal scale according to the cognitive capacities, efforts, time, and costs needed to acquire it. High grades of knowledge demanding well-developed cognitive skills, years of study, research, professional training, and experience to be understood by the recipients of the information have to be distinguished from lower grades of knowledge, requiring much less educational achievement, less professional skills, and less experience to be understood, and from everyday routine knowledge easily understood by almost anybody. Such an ordinal differentiation of knowledge seems to be indispensable when it comes to the spatial dissemination of various categories of knowledge.

An Attempt to Construct a More Realistic Communication Model
When studying the communication and spatial dissemination of different categories of knowledge it is first necessary to consider both the cognitive processes of a communicator and potential recipients of information and the intervening obstacles and learning loops within the communication process. In this chapter, the emphasis is on microprocesses of communication, on factors that influence the knowledge transfer between individuals, such as the role of cognitive skills, competencies, interests, needs, motivation, beliefs, and ideologies. This micro scale of communication is the basis for communication links on the macro scale, for example, between institutions. As Foss et al. (2010) have pointed out, macro-macro links are, methodologically speaking, shorthand for a more complex substructure of individual action and interaction. For example, organizational structure never directly impacts organizational performance; it may well effect, but only indirectly, namely through influencing individual conditions, actions and interactions. (p. 464) In order to reduce the complexity of the communication process between person X in place A and person Y in place B, I propose a model focusing on some of the factors crucial to the process of knowledge exchange between communicator and recipient that can interrupt, distort, delay, modify, or stop it. They include at a minimum • the willingness of person X to share his or her knowledge with others, • the ability of person X to verbalize and codify his or her knowledge, • the degree of attention, reputation, and visibility of the platform where the information is first or predominantly presented, • the code in which an information is written, • the communication channel (and type of contact) used to transmit the information, • the place-or context-dependent chances of recipient Y to receive the information in time, • the ability of recipient Y to read the used code, • the prior knowledge 19 or cognitive and absorptive capacities needed by Y to understand the information and integrate it into his or her knowledge base (rulebased processing of information, reflective system), 20 • the willingness (motivation) of the recipient to accept the new information (associative processing of information, impulsive system), and • the pressure and control of the social environment, knowledge milieu, and culture the recipient of an information is exposed to. 21 Each stage of the communication process has a high degree of actor-, community-, and place-dependent contingency and can act like a filter, 22 letting some information pass in its original meaning and withholding, transforming, or distorting other information. In this context, the term filter is used as a metaphor for various cognitive processes, mind-sets, thought-styles, 23 and power relations that influence 19 Prior knowledge is not something people possess; it is something they constantly develop in a way similar to the knowledge spiral described by Nonaka and Takeuchi (1995, p. 71). Such learning processes may encompass personal experience, professional training, graduation in a scientific discipline, or encultured knowledge (Blackler, 2002) arising from socialization and acculturation in specific cultural settings or shaped by stable relationships in organizational routines and interpersonal relationships. Prior knowledge also includes latent subconscious experience and intuition. 20 In recent years many social and cognitive psychologists have proposed that social behavior is controlled by two interacting systems-the reflective and the impulsive system-that follow different operating principles (for an overview of the literature see Krishna & Strack, 2017;Smith & DeCoster, 2000;Strack & Deutsch, 2004. "The reflective system generates behavioral decisions that are based on knowledge about facts and values, whereas the impulsive system elicits behavior through associative links and motivational orientations" (Strack & Deutsch, 2004, p. 220). 21 It goes without saying that both the communicator and recipient of information are embedded in and influenced by contexts and spatial relations that affect the generation and diffusion of knowledge. However, this topic has already been discussed elsewhere (Meusburger, 2008(Meusburger, , 2009a(Meusburger, , 2013(Meusburger, , 2015a and will not be repeated here. 22 The concept of filter has already been used by Fiedler andWänke (2009), Shera (1970) and Wagner and Sternberg (1987). "Knowledge…is the consequence of a filtering process; the process of filtering…facts through the ethical system or the intellectual system, or the system of scholar-ship…of the individual who receives it" (Shera, 1970, p. 96). In a similar way, Meusburger (1998) and Andrews and Delahaye (2000) examine the influence of the psychological filter on knowledge processes. Psychological determinants of individual engagement in knowledge sharing are also examined by Osterloh and Frey (2000). 23 Fleck (1935Fleck ( /1979 defines "thought style as the readiness for directed perception and appropriate assimilation of what has been perceived" (p. 142). In a more detailed definition he describes the selectivity and direction of the perception, processing, evaluation, and interpretation of incoming information and the enactment of knowledge into practice. At each step of the communication process, selective perception, loss of information, misunderstandings, distortions, and misrepresentations are possible. The effects of these filters and other cultural, social, and psychological factors and processes are the most important reason why certain grades and contents of knowledge circulate only between particular people and places and bypass others, why the dispersion of particular research results is delayed for many years, and why certain categories of knowledge travel at different speeds and very selectively in the spatial dimension.
Any visualized model runs the risk of being misunderstood as a description of static relations and mechanistic interactions. In reality, these processes and steps of communication are not arranged sequentially as depicted in Fig. 2.3. They must be conceived of as interactive learning loops that incorporate cognitive skills, intellectual capacities, interests, motives, and prejudice of agents; organizational structures, strategic visions, resources, and work practices of social systems (institutions); and cultural influences, power relations, and spatial contexts.
The first step in the communication process is clarifying whether and to what extent a producer (communicator) of new knowledge is willing to share his or her knowledge. Andrews and Delahaye (2000); Cabrera, Collins, and Salgado (2006); and others identified various psychological, organizational, and system-related determinants of individual engagement in knowledge sharing. Scholars and other holders of valuable knowledge "actively make decisions about what knowledge they would share with whom, when" (Andrews & Delahaye, 2000, p. 803). In many situations, it may be wise or an advantage to leave competitors or opponents uncertain about one's knowledge and goals. A new bargain is normally made public only after it has been signed. Particular scientific results may be shared only if scholars trust their colleagues or after the research results have been published or patented. Scholars, inventors, journalists, and other agents want to retain the ownership of their ideas. In the interviews conducted by Andrews and Delahaye (2000), "scientists spoke of the enormous personal impact of sharing knowledge unwisely: they could be swallowed up, cut out of the chain, and risked losing credit, visibility, first authorship, and a place on the patent" (p. 803).
The act of keeping knowledge secret, or restricting access to it, has a long tradition in human history because it provides the owner of secret knowledge competitive advantages or privileges. Many religions had their holy or secret knowledge that priests or shamans passed on only to chosen successors; some religions had temple precincts and sanctums that only priests were allowed to enter. In modern "thought style as [the readiness for] directed perception, with corresponding mental and objective assimilation of what has been so perceived. It is characterized by common features in the problems of interest to a thought collective, by the judgment which the thought collective considers evident, and by the methods which it applies as a means of cognition. The thought style may also be accompanied by a technical and literary style characteristic of the given system of knowledge" (Fleck, 1935(Fleck, /1979  The second question affecting the communication process is whether and to what extent a producer of new knowledge is able to articulate that knowledge in language, signs, and gestures; to codify it; to transform it into physical objects (e.g., scientific instruments, machines); or to demonstrate and teach his or her superior competence in other ways. It is common knowledge that a person knows more than he or she is able to articulate to someone else.
No matter how a given case may be described, the description is always a simplification permeated with apodictic and graphic elements. Every communication and, indeed, all nomenclature tends to make any item of knowledge more exoteric and popular. Otherwise each word would require a footnote to assign limitations and provide explanations. Each word of the footnote would need in turn a second word pyramid. (Fleck, 1935(Fleck, /1979 The third issue concerns the code in which new information is transformed. Different producers of knowledge are proficient in or prefer different codes. Some codes are understood by a large number of people; others, by only a few. A manuscript published in Estonian has fewer potential readers than a publication in English. The learning of a code may be costly and time consuming. Knowing a code "will discriminate between those who can grasp the meaning of the messages, and those who cannot (or at least have to sink in very high costs to learn…the codebook)" (Breschi & Lissoni, 2001b, p. 262).
The fourth factor that can enhance or confine dispersion of knowledge concerns the platforms on which (new) knowledge is presented. Experts, scientists, professionals, and other sources of knowledge require a platform of attention that effectively puts them in the spotlight and promotes their results and ideas in the relevant media. Different platforms achieve impulses of varying strength; they have dissimilar reputations, credibility, visibility, and audibility and therefore attract unequal attention. Because people's memory and information-processing capacities are limited, their attention is selective and a scarce resource (Franck, 1998). Selectivity in perception determines what is learned and kept in memory and what is excluded. Judgment of significance is neither impartial nor spatially invariant. Considering today's flood of information, the contents of a message or its usefulness for society are often less important for its wide diffusion than the platform on which it is presented. Manipulating the access to platforms of varying importance is an effective instrument of executing power.
The fifth factor concerns the channel or medium (TV news, scientific journal, book, lecture at university, Internet) through which new information is made public. Different media of transmission reach different audiences and have unequal ranges of coverage. In authoritarian states most of the media channels are controlled by institutions of political power; therefore, specific messages will not be distributed.
The next three steps of the communication process concern the potential recipients of information. Most studies on knowledge transfer overemphasize the provider and codifier of knowledge and assume that potential recipients will understand, accept, and use the knowledge available to them. In reality, the sources and trans-mitters of knowledge have limited influence on the extent to which their knowledge is accepted and processed or on the way it is interpreted elsewhere.
The first question is whether a recipient has the resources or technical devices to receive the new information in time and to communicate with others. Millions of people have no access to the Internet, and even more will never have a chance to use a university library or access e-journals. If the resources to receive a message are available, the next question is whether the recipient is able to read the code in which it is written. At the beginning of the twenty-first century some 900 million people were illiterate. Most western scholars are not proficient in Chinese, Arabic, or Hebrew letters. Some are quite helpless when it comes to mathematical or chemical formula. In science and the humanities, language barriers are among the most severe impediments for the exchange of knowledge (for details see Paasi, 2015). 24 A recipient may indeed be able to read incoming knowledge, but it nonetheless has to pass at least three more filters before it has been successfully processed and incorporated into that person's existing knowledge base. The first is the recipient's level of factual knowledge, the second his or her decision about the usefulness or relevance of the new information, and the third his or her orientation knowledge.
Even after a recipient has received knowledge from an external source, he must still figure out how to use it. The recipient must appraise, adapt, and ultimately "transform" whatever he has learned from the source in order for it to be useful in his work context. (Tortoriello et al., 2012(Tortoriello et al., , p. 1026 The filter of factual knowledge decides whether a person is able to understand the semantic meaning of the incoming information, to evaluate its importance and shortcomings, to recognize its usefulness and far-reaching implications for his or her needs and goals, to integrate it into his or her knowledge base, and to transform the knowledge into action. The evaluation of the usefulness of knowledge is a function of prior knowledge, but is also influenced by context-and discipline-specific factors (for details see Froese & Mevissen, 2016). Experts in different domains, with different levels of expertise and different strategic interests, may evaluate new incoming information disparately. Persons who have not completed years of study and research in molecular biology or theoretical physics have little or no use for the scientific publications available in those fields. Most agents are searching for domain-specific knowledge, with knowledge of other domains being regarded irrelevant and useless. Knowledge acquired in order to survive in polar regions is not expedient for nomads in a desert.
Even between scholars in the same discipline, communication can falter when individuals adhere to different thought styles or thought communities or do not have the discursive openness necessary to accept colleagues' new methods or theories. 25 "The greater the difference between two thought styles, the more inhibited will be the communication of ideas" (Fleck, 1935(Fleck, /1979. In extreme cases, the thought style "constrains the individual by determining 'what can be thought in no other way.' Whole eras will then be ruled by this thought constraint" (p. 99).
The organic exclusiveness of every thought commune goes hand in hand with a stylized limitation upon the problems admitted. It is always necessary to ignore or reject many problems as trifling or meaningless. Modern science also distinguishes "real problems" from useless "bogus problems." This creates specialized valuation and characteristic intolerance, which are features shared by all exclusive communities. (p. 104) A thought style can influence the perception and interpretation of information and in extreme cases it can constrain, inhibit, and determine the way of thinking.
Under the influence of a thought style one cannot think in any other way. It also excludes alternative modes of perception. Accordingly, no proper communication can arise between different thought styles. A thought style functions at such a fundamental level that the individual seems generally unaware of it. It exerts a compulsive force upon his thinking, so that he normally remains unconscious both of the thought style as such and of its constraining character. Yet such a style can be revealed in practice by an examination of how it is applied. The existence of stable thought collectives suggests the presence of a rather permanent thought style. (Trenn & Merton, 1979, p. 159) The third filter for incoming information concerns orientation knowledge and spontaneous impulses. Orientation knowledge normally is equated with religious, cultural, and ideological knowledge. However, some theoretical concepts and paradigms used in scientific disciplines also prove to be based on prejudice, preconception, and jaundice. The obstinate adherence to a specific scientific paradigm or school of thought can entail the same detrimental effects as ideological prejudice. 26 Orientation knowledge has a bearing on whether new information is emotionally or ideologically rejected, whether it is compatible with the recipient's self-perception, emotions, and identity. Information may be rejected because it questions the recipient's own research or thought style, because it shatters the reputation of a thought community, a scientific school, or scientific approach a person is associated with. Decisions to accept or repudiate new information may occur mindlessly or automatically; that is, "without directing much attention to the utility of an outcome, a person may act the way he or she has acted many times before" (Strack & Deutsch, 2004, p. 220).
The dichotomy between factual knowledge and orientation knowledge can be enhanced by the dichotomy of reflexive and impulsive thought. In recent years, psychologists proposed that social behavior is the effect of two interacting systems of information processing or two modes of judgment-the reflective system and the impulsive system-that follow different operating principles (for an overview of the 26 Followers of traditional neoclassical theory argued for decades that the homo oeconomicus acts in a more or less homogeneous space and has access to the information needed for rational decision-making. In the last 20 or 30 years, most of these ideas were largely discredited, not only in science studies, geography of knowledge, or actor-network theory, but also in evolutionary economics, behavioral economics, the concepts of bounded rationality, new theories of the firm, or the strategic management approach. literature see Krishna & Strack, 2016;Smith & DeCoster, 2000;Strack & Deutsch, 2004. The reflective system is determined by deliberate thought and generates decisions that are based on knowledge about facts and values. It operates according to propositional principles; it is flexible, effortful, slow, requires motivation, and its operation is typically conscious. It is driven by working memory resources, which sets limits for its capacity for information processing. The impulsive system operates according to associative principles; it is inflexible, effortless, always active, and may operate unconsciously. The impulsive system can be seen as long-term memory and therefore has functionally unlimited capacity (Strack & Deutsch, 2004, pp. 220-223;Krishna & Strack, 2016).
The reflective system requires a high amount of cognitive capacity.... In contrast, the impulsive system requires little cognitive capacity and may control behavior under suboptimal conditions. As a consequence, processes of the reflective system are disturbed more easily than those of the impulsive system (Strack & Deutsch, 2004, p. 223)

Conclusion
An in-depth model of the communication process between a source of knowledge and recipient of information is the foundation of any research about the mobility of different categories of knowledge. The spatial diffusion of knowledge depends both on the willingness of the producer to share his or her knowledge and the skills, experiences, and cognitive processes of the potential recipients of information. Research on knowledge-spillovers, knowledge-sharing, or territorial knowledge dynamics has focused more or less on successful cases of learning and knowledge exchange. It seldom asked the question why the diffusion of knowledge within clusters or networks failed. This paper shows that the category, grade, and content of knowledge; the code and channels of transmission; the prior knowledge of potential recipients; and some other factors decide about the speed and target locations of the spatial diffusion of knowledge. It explains why large proportions of high-grade knowledge (certain scientific results) can only be spread to a small number of target locations. Only very simple, everyday low-grade knowledge can be communicated in a way that it reaches large parts of the world in a short period of time and at no or little cost. Even some types of low-grade knowledge can get lost at one of the steps of the communication model or not run unchanged through the communication process.
The model can be further amended by issues of how knowledge is legitimated; how individual knowledge becomes collective knowledge of an organization; how knowledge is transformed into organizational routines and structures; how the processing of information is modified by the presence of others; how the communication process is influenced by an organization's size and hierarchic structure; and to what extent knowledge governance "can influence the processes of using, sharing, integrating, and creating knowledge in preferred directions and towards preferred levels" (Foss et al., 2010, p. 456; see also Spender, 2005).