Andreu Mas-Colell revolutionized our understanding of competitive markets, price formation, and the behavior of market participants. General Equilibrium and Game Theory offers readers a compendium of his most important scholarly contributions, gathering in a single volume the groundbreaking papers that have solidified his standing as one of the preeminent economic theorists of our time.

Built upon the foundations of neoclassical economics, Mas-Colell’s work is distinguished by a mathematical and analytical elegance that brings theory closer to real-world situations. He overturns the standard assumption of general equilibrium theory—that markets are perfectly competitive and their participants are perfectly rational—and concludes that neither the law of supply and demand nor the existence of equilibrium prices depends on the rationality of agents. Similarly, Mas-Colell (working with Sergiu Hart) challenges classical game theory’s reliance on rational behavior, demonstrating that adaptation and learning shape the dynamics of repeated games.

Addressing central questions of finance, trade, industrial organization, and welfare economics, Mas-Colell shows the surprising power and versatility of differentiability and linear-space mathematical techniques, and he emphasizes the fruitfulness of cooperative game-theory approaches, such as Shapley value theory and the Bargaining Set, for understanding competition and distribution. General Equilibrium and Game Theory is a signal contribution to economic theory and an invaluable resource for anyone wishing to study the craft of a master of economic modeling.

Perhaps the most important economic development of recent years has been the integration process engaged in by European countries. Today other groups of countries throughout the world either contemplate or have already undertaken similar courses of action. Although professional economists have already devoted much attention to the subject, considerable work remains to be done. The present study represents an attempt to advance our scientific knowledge in this direction.

This work is entirely theoretical and fully deductive. Its contribution lies both in the method used and in the conclusions reached. In contrast to most previous studies of customs unions and economic integration, exclusive use is made of general-equilibrium analysis. Because interpretation of mathematical results bearing on comparative statistics of suboptimal situations was found impossible, the author has depended wholly upon geometry. While the geometrical method does not allow inclusion of large numbers of variables, it often leads to, or at least intuitively suggests, important generalizations.

The findings, summarized in 107 points at the end of the study, can be classified in two distinct categories. On the one hand, a number of results are derived concerning the trade effects of international discrimination and customs unions—that is, the effects on the volumes of exports and imports and on relative international values. On the other hand, the more important portions of this work study the effects of customs unions on the welfare of the union, the welfare of the rest of the world, and the global efficiency of resource allocation in the world as a whole. Inter-country welfare comparisons and the use of cardinal utility indexes are entirely avoided. Rather, the author uses the concept of ordinal utility, and makes extensive use of utility-possibility analysis. With respect to the latter, the study of customs unions actually suggests a new method applicable to a wide range of other suboptimal situations in general equilibrium.

This book presents an original exposition of general equilibrium theory for advanced undergraduate and graduate-level students of economics. It contains detailed discussions of economic efficiency, competitive equilibrium, the first and second welfare theorems, the Kuhn-Tucker approach to general equilibrium, the Arrow-Debreu model, and rational expectations equilibrium and the permanent income hypothesis. Truman Bewley also treats optimal growth and overlapping generations models as special cases of the general equilibrium model. He uses the model and the first and second welfare theorems to explain the main ideas of insurance, capital theory, growth theory, and social security. It enables him to present a unified approach to portions of macro- as well as microeconomic theory. The book contains problems sets for most chapters.

This Solutions Manual contains answers to most of the problems in General Equilibrium, Overlapping Generations Models, and Optimal Growth Theory. Truman F. Bewley’s indispensable textbook—a cornerstone of courses on microeconomics, general equilibrium theory, and mathematical economics—covers the main premises behind insurance, capital theory, growth theory, and social security. Detailed explanations provide guidance to advanced undergraduate and graduate students, leading to in-depth understanding of Bewley’s unified approach to macroeconomics theory.