Andrew MAS-COLELL, economist in the field of General Equilibrium Theory; Mathematical Methods. Fellow, Econometric Society, since 1978; Sloan Fellow, 1978-1980.

##
Background

MAS-COLELL, Andrew was born in 1944 in Barcelona, Spain.

##
Education

Licenciado en Ciencias Economics University Bilbao, 1967. Doctor of Philosophy University Minnesota, 1972.

##
Career

Assistant Professor Economics Mathematics, Association Professor Economics Mathematics, Professor Economics Mathematics, University California Berkeley,
7, 1977-1979, 1979-1981. Professor of Economics, Harvard University, United States of America, since 1981. Association Editor, Journal of Economic Theory,
80.

Society for Industrial and Applied Mathematics J. Applied Mathematics, 1976-1979. Journal of Mathematical Economics, since 1977. Econometrica, since 1978.

## Views

General field of research: mathematical economics and economic theory. Main contributions have been to several foundational aspects of demand and general equilibrium theory. In particular extension of the Walras-Arrow-DebreuMcKenzie model to situations with differentiated commodities or with agents not satisfying some of the traditional rationality or convexity postulates.

Use and development of calculus and differential topological tools for the examination of the structure of price equilibria (uniqueness, local uniqueness, comparative statics, index of equilibria, etc.). Relationships between the notion of price-taking equilibrium and a variety of solution concepts (descendant from Cournot and Edgeworth) incorporating strategic interdependences.