An Algebraic Proof of the Existence of a Competitive Equilibrium in Exchange Economies

DOI: 10.4236/tel.2014.43031   PDF   HTML   XML   3,940 Downloads   4,952 Views  


The standard excess demand argument for existence of competitive equilibria in exchange economies invokes maximizing the market value of the aggregate excess demand function and thereby adjusting the prices toward equilibrium. By exploiting the Perron-Frobenius theorem on stochastic matrices, we offer an algebraic proof of the existence of a competitive equilibrium without resorting to such a device of excess demand.

Share and Cite:

Sun, G. (2014) An Algebraic Proof of the Existence of a Competitive Equilibrium in Exchange Economies. Theoretical Economics Letters, 4, 232-234. doi: 10.4236/tel.2014.43031.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Debreu, G. (1983) Four Aspects of the Mathematical Theory of Economic Equilibrium. In: Mathematical Economics: Twenty Papers of Gerard Debreu, Cambridge University Press, New York, 217-231.
[2] Mas-Colell, A., Whinston, M.D. and Green, J. (1995) Microeconomic Theory. Oxford University Press, Oxford.
[3] Jehle, G.A. and Reny, P.J. (2000) Advanced Microeconomic Theory. 2nd Edition, Addison Wesley, Boston.
[4] Aldrovandi, R. (2001) Special Matrices of Mathematical Physics. World Scientific, Singapore.

comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.