Abstract
This paper presents a non-equilibrium, agent-based model of workers and firms, with on-the-job searching, endogenous entrepreneurial decisions and endogenous wage and income determination. Workers and firms are heterogeneous, and learn their strategy in the labor market. The model is able to reproduce a number of stylized facts generally accepted in labor economics and industrial organization, such as the Wage, Beveridge and Okun curve, and the skewness of wage, income and firm size distribution. Most interestingly, important stylized facts such as a negatively sloped Wage Curve and a constant returns to scale matching function emerge only out-of-equilibrium, during the adjustment processes toward the stationary state. Thus, from a theoretical point of view the model suggests that taking these stylized facts as “building blocks” of equilibrium models might be misleading. The results stress two additional points. From a methodological point of view, the use of non-equilibrium computational models allows for a more comprehensive investigation of the labor market, by considering the endogenous character of many relevant variables. From an empirical point of view, the joint determination of all aggregate relationships and their dependence on the equilibrium or non-equilibrium state of the system suggest to move from the investigation of empirical regularities in isolation one from the other to a joint analysis.
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References
Aghion, P. and Howitt, P. (1994). Growth and unemployment. Review of Economic Studies, 61(3), 477–494.
Albrecht, J.W. Gautier, P.A. and Vroman, S. B. (2003). Matching with multiple applications. Economic Letters, 78, 67–70.
Attfield, C. and Silverstone, B. (1997). Okun's coefficient: A comment. Review of economics and statistics, 79, 326–329.
Axtell, R. (2001). Zipf distribution of u.s. firm size. Science, 293, 1818–1820.
Bell, B., Nickell, S. and Quintini, G. (2002). Wage equations, wage curves and all that. European Economic Review, 9, 341–360.
Blanchard, J.O. and Diamond, P. (1990). The aggregate matching function, Growth, Productivity, Unemployment, MIT Press.
Blanchflower, D. and Oswald, A. (1994). The wage curve, MIT Press, Cambridge, MA.
Burdett, K. (1978). A theory of employee job search and quit rates. American Economic Review, 68, 212–220.
Burdett, K., Shi, S. and Wright, R. (2001). Pricing and matching with frictions. Journal of Political Economy, 109(5), 1060–1085.
Caballero R.J. and Hammour, M. L. (1994). The cleansing effect of recessions. American Economic Review, 84, 1350–1368.
Card, D. (1995). The wage curve: A review. Journal of Economic Literature, 33, 785–799.
Diamond, P. (1971). A model of price adjustment. Journal of Economic Theory, 3(2), 156–168.
Diamond, P. (1981). Mobility costs, frictional unemployment, and efficiency. Journal of Political Economy, 89(4), 798–812.
Diamond, P. (1982a). Aggregate demand management in search equilibrium. Journal of Political Economy, 90(5), 881–894.
Diamond, P. (1982b). Wage determination and efficiency in search equilibrium. Review of Economic Studies, 49(2), 217–227.
Fagiolo, G., Dosi, G. and Gabriele, R. (2004). Matching, bargaining, and wage setting in an evolutionary model of labor market and outut dynamics. Advances in Complex Systems, 7(2), 157–186.
Fonseca, R., Lopez-Garcia, P. and Pissarides, C.A. (2001). Entrepreneurship, startup costs and unemployment. European Economic Review, 45, 692–705.
Gaffeo, E., Gallegati, M. and Palestrini, A. (2003). On the size distribution of firms: Additional evidence from the g7 countries. Physica A, 324, 117–123.
DelliGatti, D. et al. (2004). Business cycle fluctuations and firms' size distribution dynamics. Advances in Complex Systems, 7, 223–240.
Jovanovic, B. (1979). Job matching and the theory of turnover. Journal of Political Economy, 87, 973–990.
Lagos, R. (2000). An alternative approach to search frictions. Journal of Political Economy, 108(5), 851–873.
Leombruni R. and Richiardi, M.G. (2005). Why are economists sceptical about agent-based simulations?. Physica A (forthcoming).
Mortensen, D.T. (1982a). The matching process as a non-cooperative bargaining game. The Economics of Information and Uncertainty, University of Chicago Press, Chicago.
Mortensen, D.T. (1982b). Property rights and efficiency in mating, racing, and related games. American Economic Review, 72(5), 968–979.
Mortensen, D.T. and Pissarides, C.A. (1994). Job creation and job destruction in the theory of unemployment. Review of Economic Studies, 61, 397–415.
Mortensen, D.T. (1999). New developments in models of search in the labor market. Handbook of Labor Economics (O. C. Ashenfelter and D. Card, eds.), North-Holland, Amsterdam.
Neal, D. and Rosen, S. (2000). The theory of earnings distributions, Handbook of Income Distribution (A. Atkinson and F. Bourgignon, eds.), North-Holland.
Okuyama, K., Takayasu, M. and Takayasu, H. (1999). Zipfs law in income distribution of companies. Physica A, 269 125–131.
Petrongolo, B. and Pissarides, C.A. (2001). Looking into the black box: A survey of the matching function. Journal of Economic Literature, 39, 390–432.
Phelps, E.S. (ed.). (1970). Microeconomic foundations of employment and inflation theory. Norton.
Pissarides, C.A. (1984a). Efficient job rejection. Economic Journal, 94, 97–108.
Pissarides, C.A. (1984b). Search intensity job advertising and efficiency. Journal of Labor Economics, 2(1), 128–143.
Pissarides, C.A. (2000). Equilibrium unemployment theory. 2 ed., MIT Press, Cambridge, MA.
Prachowny, M. (1993). Okun's law: Theoretical foundations and revised estimates. Review of Economics and Statistics, 75, 331–336.
Richiardi, M.G. (2004). A search model of unemployment and firm dynamics. Advances in Complex Systems, 7(2), 203–221.
Rogerson, R., Shimer, R. and Wright, R. (2004). NBER Working Papers, no. 10655.
Smith, A.E. and Zenou, Y. (2003). A discrete-time stochastic model of job matching. Review of Economic Dynamics, 6(1), 54–79.
Sonnessa, M. (2004). The jas (java agent-based simulation) library. Industry and Labor Dynamics: The Agent-based Computational Economics Approach. Proceeding of the Wild@Ace 2003 conference” (Singapore) (R. Leombruni and M. Richiardi, eds.), World Scientific Press.
Stigler, G.J. (1961). The economics of information. Journal of Political Economy, 69(2), 213–225.
Tesfatsion, L. (2005). Agent-based computational economics: A constructive approach to economic theory. Handbook of Computational Economics, Volume 2: Agent-Based Computational Economics, North-Holland, (forthcoming).
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JEL Classifications: J60, L11, C15.
An erratum to this article can be found at http://dx.doi.org/10.1007/s10614-006-9050-6
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Richiardi, M. Toward a Non-Equilibrium Unemployment Theory. Comput Econ 27, 135–160 (2006). https://doi.org/10.1007/s10614-005-9019-x
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DOI: https://doi.org/10.1007/s10614-005-9019-x