Abstract
The urban space paper is introduced by a brief “report” on the founding of Rome by Romulus; he traced a furrow and thereby defined the urban space. The core of the paper, however, defines the urban space by the dimension of collective decision-making expressed in the form of voting games. It offers a power index analysis of the relationship between the agents of a network—applying the Public Good Index (PGI) and the Public Value (PV)—reinterprets previous work by Holler and Rupp (Power in networks: A PGI analysis of Krackhardt’s Kite Network. Transactions on computational collective intelligence. Springer, Heidelberg, 2019), and presents new numerical results and gives alternative interpretations. The results confirm our expectations: an increase of links and thereby connectedness tends to increase the power of an agent. The message for policymaking in the urban space is evident. This motivated us to discuss the question of why we should be interested in evaluating the power distribution within a network. Here, our focus is on the accountability of the agents—and the Smart City concept.
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Notes
- 1.
This date is given in Fustel de Coulange (2006 [1864]: 138). The following account derives from this text.
- 2.
These intervals of carrying the plow were called portae (Fustel de Coulange 2006 [1864]: 138).
- 3.
Holler and Marciano (2010) discussed Machiavelli’s “possibility hypothesis” with reference to Arrow’s notorious “impossibility theorem” which says that, given a set of quite reasonable condition, we cannot exclude that an aggregation of individual preference fails and we cannot derive a social welfare function—unless we accept that it is dictatorial (see Arrow (1963[1951]).
- 4.
- 5.
Vertex D has the highest degree centrality, H and I rate highest with respect to betweenness centrality, and F and G have, on the average, the shortest path distance to the other vertices (closeness centrality).
- 6.
The swing players define the power for the indices of Shapley–Shubik, Penrose–Banzhaf–Coleman, Johnston, and Deegan–Packel. These measures vary in what coalitions are to be considered and how the coalition surplus is distributed among their members.
- 7.
Myerson (1977) presents a bargaining model for networks that connects the (fair) bargaining outcome and the corresponding Shapley value.
- 8.
For a recent discussion of the PGI, see Holler (2019). Note there are more than ten power indices, but there is only one measure that is serious about measuring the impact of a player in producing a public good, i.e., the PGI.
- 9.
- 10.
In general, parliaments and city councils do not change their majority rules if links between parties altered, and, in the extreme, a party became unconnected to any other like going from Γ and Γ1.
- 11.
In order to form a winning coalition, i needs to be connected to at least d − 1 vertices (such that they form a connected subgraph). The required d − 1 many nodes can be on any side of i in the network such that the winning coalitions i belong to a circle/sphere with maximal radius d − 1. Here, the notion of a radius is in terms of graph neighborhoods: if i has a high enough degree it may be the case that the coalition is formed by direct neighbors of i only, i.e., i is connected to each of the members of its coalition by minimal paths of length 1. In this sense, the worst case that can occur, maximizing the distance, is that actually a d − 1 neighbor has to be a member of the coalition. (The shortest path between i and this vertex has length d − 1).
- 12.
In his Picture of Dorian Gray, Oscar Wilde characterized a Radical member of Parliament by the by now notorious quote: “Like all people who try to exhaust a subject, he exhausted his listeners.”
- 13.
For a more intensive discussion of the relationship of power and responsibility, see Holler (2007).
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The authors would like to thank Barbara Klose-Ullmann for the helpful comments.
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Holler, M.J., Rupp, F. (2020). Power in Networks and the Urban Space. In: Macrì, E., Morea, V., Trimarchi, M. (eds) Cultural Commons and Urban Dynamics. Springer, Cham. https://doi.org/10.1007/978-3-030-54418-8_4
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