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Indeterminacy of Equilibrium in Dynamic Models with Externalities

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  • Michele Boldrin
  • Aldo Rustichini

Abstract

In this paper we study the indeterminacy of equilibria in infinite horizon capital accumulation models with technological externalities. Our investigation encompasses both models with bounded and unbounded accumulation paths, and models with one and two sectors of production. Under reasonable assumptions we find that equilibria are locally unique in the one sector economies, at least as long as cycles are not present and trajectories are therefore monotone. On the other hand we show (by means of an example) that persistent oscillations are possible when the external effect is particularly strong and capital accumulation is bounded. In this case indeterminacy maybe present as we are unable to rule out the eexistence of a continuum of equilibria converging to the cycle. The situation is different in economies with two sectors of production. Here it is very easy to construct analytical examples where a positive external effect induces a two dimensional manifold of equilibria converging to the same steady state (in the bounded case) or to the same constant growth rate (in the unbounded case), For the latter we also point out that the dynamic behavior of these equilibria is quite complicated and that persistent fluctuations in their growth rates are possible.

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Paper provided by Northwestern University, Center for Mathematical Studies in Economics and Management Science in its series Discussion Papers with number 955R.

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Date of creation: May 1991
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Handle: RePEc:nwu:cmsems:955r

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  1. Howitt, Peter & McAfee, R Preston, 1988. "Stability of Equilibria with Externalities," The Quarterly Journal of Economics, MIT Press, vol. 103(2), pages 261-77, May.
  2. Marianne Baxter & Robert G. King, 1991. "Productive externalities and business cycles," Discussion Paper / Institute for Empirical Macroeconomics 53, Federal Reserve Bank of Minneapolis.
  3. Timothy J. Kehoe & David K. Levine & Paul M. Romer, 1990. "On characterizing equilibria of economies with externalities and taxes as solutions to optimization problems," Working Papers 436, Federal Reserve Bank of Minneapolis.
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