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Optimality and Natural Selection in Markets

  • Lawrence E. Blume

    (Cornell University)

  • David Easley

    (Cornell University)

Evolutionary arguments are often used to justify the fundamental behavioral postulates of competive equilibrium. Economists such as Milton Friedman have argued that natural selection favors profit maximizing firms over firms engaging in other behaviors. Consequently, producer efficiency, and therefore Pareto efficiency, are justified on evolutionary grounds. We examine these claims in an evolutionary general equilibrium model. If the economic environment were held constant, profitable firms would grow and unprofitable firms would shrink. In the general equilibrium model, prices change as factor demands and output supply evolves. Without capital markets, when firms can grow only through retained earnings, our model verifies Friedman's claim that natural selection favors profit maximization. But we show through examples that this does not imply that equilibrium allocations converge over time to efficient allocations. Consequently, Koopmans critique of Friedman is correct. When capital markets are added, and firms grow by attracting investment, Friedman's claim may fail. In either model the long-run outcomes of evolutionary market models are not well described by conventional General Equilibrium analysis with profit maximizing firms.

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File URL: http://econwpa.repec.org/eps/ge/papers/9712/9712003.pdf
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Paper provided by EconWPA in its series GE, Growth, Math methods with number 9712003.

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Length: 33 pages
Date of creation: 25 Dec 1997
Date of revision: 09 Jul 1998
Handle: RePEc:wpa:wuwpge:9712003
Note: Type of Document - Acrobat; prepared with pdftex; pages: 33; figures: in a separate acrobat file.
Contact details of provider: Web page: http://econwpa.repec.org

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  1. Alvaro Sandroni, 2000. "Do Markets Favor Agents Able to Make Accurate Predicitions?," Econometrica, Econometric Society, vol. 68(6), pages 1303-1342, November.
  2. Dutta, Prajit K & Radner, Roy, 1999. "Profit Maximization and the Market Selection Hypothesis," Review of Economic Studies, Wiley Blackwell, vol. 66(4), pages 769-98, October.
  3. Winter, Sidney G, 1971. "Satisficing, Selection, and the Innovating Remnant," The Quarterly Journal of Economics, MIT Press, vol. 85(2), pages 237-61, May.
  4. Blume, Lawrence E. & Easley, David, 1982. "Learning to be rational," Journal of Economic Theory, Elsevier, vol. 26(2), pages 340-351, April.
  5. Sidney G. Winter, 1964. "Economic "Natural Selection" and the Theory of the Firm," LEM Chapters Series, in: Yale Economic Essays, pages 225-272 Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
  6. Blume, Lawrence & Easley, David, 1992. "Evolution and market behavior," Journal of Economic Theory, Elsevier, vol. 58(1), pages 9-40, October.
  7. Armen A. Alchian, 1950. "Uncertainty, Evolution, and Economic Theory," Journal of Political Economy, University of Chicago Press, vol. 58, pages 211.
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