This 1991 book is a selection of Jacques Drèze's work over the last decade on the topics of lasting unemployment, stagflation and unused capacity. At the theoretical level, the author has contributed to the formulation and analysis of general equilibrium models which allow for price rigidities and excess supply and lend themselves to econometric implementation, thus represents an attempt to integrate micro- and macroeconomics, and to use theory for empirical and policy purposes.

While most standard economic models of international trade assume full employment, Carl Davidson and Steven Matusz have argued over the past two decades that this reliance on full-employment modeling is misleading and ill-equipped to tackle many important trade-related questions. This book brings together the authors' pioneering work in creating models that more accurately reflect the real-world connections between international trade and labor markets. The material collected here presents the theoretical and empirical foundations of equilibrium unemployment modeling, which the authors and their collaborators developed to give researchers and policymakers a more realistic picture of how international trade affects labor markets, and of how transnational differences in labor markets affect international trade. They address the shortcomings of standard models, describe the empirics that underlie equilibrium unemployment models, and illustrate how these new models can yield vital insights into the relationship between international trade and employment. This volume also includes an indispensable general introduction as well as concise section introductions that put the authors' work in context and reveal the thinking behind their ideas. Economists are only now realizing just how important these ideas are, making this book essential reading for researchers and students.

Kalecki's opus has been acknowledged chiefly as a contribution to the theory of distribution and the business cycle. Little attention has been given to the theory of effective demand and to unemployment equilibrium, i.e. to the field traditionally covered by Keynesian economics. This book is an attempt to draw attention to the most innovative core of Kalecki's thought on capitalist economies, which is also strictly interrelated to the history of economic thought. Accordingly, it focuses on the relationships with other theoretical approaches, to methodology and the theory of effective demand and investment, to the theory of distribution and prices, and to the theory of money.

This dissertation analyzes the possibility that high unemployment can be be self-reinforcing through its effects on the distribution of income and, consequently, aggregate demand. The major results of my work demonstrate that these forces can lead to multiple macroeconomic equilibria which are indexed by the level of unemployment. By characterizing low output and employment states as equilibrium outcomes, this thesis provides a coherent theoretical explanation for periods of persistently high unemployment. The key property throughout is non-homotheticity of consumers' preferences, whereby the market demand for goods changes as income distribution changes, even if the total income of all consumers remains fixed. This implies that, unlike in many macroeconomic models, demand cannot be generated from a representative agent and, crucially, that changes in employment along the extensive, as opposed to intensive, margin can have more severe general equilibrium consequences.

This book contains essays in honour of Claus Weddepohl who, after 22 years, is retiring as professor of mathematical economics at the Department of Quantitative Economics of the University of Amsterdam. Claus Weddepohl may be viewed as th~ first Dutch mathematical economist in the general equi librium tradition of Arrow, Debreu and Hahn. The essays in this book are centered around the themes Equilibrium, Markets and Dynamics, that have been at the heart of Weddepohl's work on mathematical economics for more than three decades. The essays have been classified according to these three themes. Admittedly such a classification always is somewhat arbitrary, and most essays would in fact fit into two or even all three themes. The essays have been written by international as well as Dutch friends and colleagues including Weddepohl's former Ph. D. students. The book starts with a review of Claus Weddepohl's work by Roald Ramer, who has been working with him in Amsterdam for all those years. The review describes how Weddepohl became fascinated by general equilibrium theory in the early stages of his career, how he has been working on the theory of markets throughout his career, and how he turned to applications of nonlinear dynamics to price adjustment processes in a later stage of his career. The first part of the book, Equilibrium, collects essays with general equilib rium theory as the main theme.

This volume is the result of a conference held at the Institute for Advanced Studies, Vienna. There is still a gap reflected both in fundamental meth odological differences and in the style of analysis between the Walrasian (and Edgeworthian) tradition of general equilibrium theory and the theo retical and policy problems raised in the framework of Keynesian and post-Keynesian macroeconomics. The conference succeeded in bringing together economic theorists working in fields ranging from abstract prob lems of mathematical equilibrium analysis to applied macroeconomic theory, and it is hoped that the present volume will contribute to bridging the above-mentioned hiatus. As organizer of the meeting and editor of its proceedings I want to thank the Institute for Advanced Studies for providing facilities and funds. I am also sincerely grateful to all my colleagues from the Institute for their generous help, in particular to Mrs Monika Herkner without whose assistance and organizational talent the conference would certainly not have been the success it in fact - in the opinion of all participants - turned out to have been. Furthermore, I wish to express my gratitude towards all participants in the meeting and contributors to the volume whose patient support of the whole enterprise proved indispensable. To Mrs Elfriede Auracher I am deeply indebted for her skillful and effective general management of the editorial work and her invaluable assistance in compiling the indexes.