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Toward a Non-Equilibrium Unemployment Theory

  • Matteo Richiardi


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    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. Copyright Springer Science+Business Media, Inc. 2006

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    Article provided by Springer & Society for Computational Economics in its journal Computational Economics.

    Volume (Year): 28 (2006)
    Issue (Month): 4 (November)
    Pages: 421-446

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    Handle: RePEc:kap:compec:v:28:y:2006:i:4:p:421-446
    DOI: 10.1007/s10614-006-9050-6
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    1. Tesfatsion, Leigh, 2006. "Agent-Based Computational Economics: A Constructive Approach to Economic Theory," Handbook of Computational Economics, in: Leigh Tesfatsion & Kenneth L. Judd (ed.), Handbook of Computational Economics, edition 1, volume 2, chapter 16, pages 831-880 Elsevier.
    2. Ricardo J. Caballero & Mohamad L. Hammour, 1991. "The Cleansing Effect of Recessions," NBER Working Papers 3922, National Bureau of Economic Research, Inc.
    3. Diamond, Peter A, 1982. "Aggregate Demand Management in Search Equilibrium," Journal of Political Economy, University of Chicago Press, vol. 90(5), pages 881-94, October.
    4. Bell, Brian & Nickell, Stephen & Quintini, Glenda, 2002. "Wage equations, wage curves and all that," Labour Economics, Elsevier, vol. 9(3), pages 341-360, July.
    5. Prachowny, Martin F J, 1993. "Okun's Law: Theoretical Foundations and Revised Estimates," The Review of Economics and Statistics, MIT Press, vol. 75(2), pages 331-36, May.
    6. Clifford L. F. Attfield & Brian Silverstone, 1997. "Okun's Coefficient: A Comment," The Review of Economics and Statistics, MIT Press, vol. 79(2), pages 326-329, May.
    7. Kenneth Burdett & Shouyong Shi & Randall Wright, 2001. "Pricing and Matching with Frictions," Journal of Political Economy, University of Chicago Press, vol. 109(5), pages 1060-1085, October.
    8. Diamond, Peter A., 1971. "A model of price adjustment," Journal of Economic Theory, Elsevier, vol. 3(2), pages 156-168, June.
    9. Petrongolo, Barbara & Pissarides, Christopher, 2000. "Looking Into The Black Box: A Survey Of The Matching Function," CEPR Discussion Papers 2409, C.E.P.R. Discussion Papers.
    10. Gaffeo, Edoardo & Gallegati, Mauro & Palestrini, Antonio, 2003. "On the size distribution of firms: additional evidence from the G7 countries," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 324(1), pages 117-123.
    11. Albrecht, James W. & Gautier, Pieter A. & Vroman, Susan B., 2003. "Matching with multiple applications," Economics Letters, Elsevier, vol. 78(1), pages 67-70, January.
    12. Mortensen, Dale T & Pissarides, Christopher, 1999. "New Developments in Models of Search in the Labour Market," CEPR Discussion Papers 2053, C.E.P.R. Discussion Papers.
    13. Anthony E. Smith & Yves Zenou, 2003. "A Discrete-Time Stochastic Model of Job Matching," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 6(1), pages 54-79, January.
    14. Pissarides, C A, 1984. "Efficient Job Rejection," Economic Journal, Royal Economic Society, vol. 94(376a), pages 97-108, Supplemen.
    15. Jovanovic, Boyan, 1979. "Job Matching and the Theory of Turnover," Journal of Political Economy, University of Chicago Press, vol. 87(5), pages 972-90, October.
    16. Aghion, Philippe & Howitt, Peter, 1991. "Growth and Unemployment," CEPR Discussion Papers 577, C.E.P.R. Discussion Papers.
    17. Leombruni, Roberto & Richiardi, Matteo, 2005. "Why are economists sceptical about agent-based simulations?," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 355(1), pages 103-109.
    18. Matteo Richiardi, 2004. "A Search Model Of Unemployment And Firm Dynamics," Advances in Complex Systems (ACS), World Scientific Publishing Co. Pte. Ltd., vol. 7(02), pages 203-221.
    19. David Card, 1995. "The Wage Curve: A Review," Journal of Economic Literature, American Economic Association, vol. 33(2), pages 285-299, June.
    20. Dale T. Mortensen & Christopher A. Pissarides, 1994. "Job Creation and Job Destruction in the Theory of Unemployment," Review of Economic Studies, Oxford University Press, vol. 61(3), pages 397-415.
    21. Peter A. Diamond, 1982. "Wage Determination and Efficiency in Search Equilibrium," Review of Economic Studies, Oxford University Press, vol. 49(2), pages 217-227.
    22. Pissarides, Christopher A, 1984. "Search Intensity, Job Advertising, and Efficiency," Journal of Labor Economics, University of Chicago Press, vol. 2(1), pages 128-43, January.
    23. Tesfatsion, Leigh & Judd, Kenneth L., 2006. "Handbook of Computational Economics, Vol. 2: Agent-Based Computational Economics," Staff General Research Papers Archive 10368, Iowa State University, Department of Economics.
    24. Fonseca, Raquel & Lopez-Garcia, Paloma & Pissarides, Christopher A., 2001. "Entrepreneurship, start-up costs and employment," European Economic Review, Elsevier, vol. 45(4-6), pages 692-705, May.
    25. Okuyama, K & Takayasu, M & Takayasu, H, 1999. "Zipf's law in income distribution of companies," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 269(1), pages 125-131.
    26. Ricardo Lagos, 2000. "An Alternative Approach to Search Frictions," Journal of Political Economy, University of Chicago Press, vol. 108(5), pages 851-873, October.
    27. George J. Stigler, 1961. "The Economics of Information," Journal of Political Economy, University of Chicago Press, vol. 69, pages 213.
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