Contained in this volume are the edited and refereed papers which were presented at a conference held at Nuffield College, Oxford in May 1987. The papers, which represent the recent research of a group of eminent economists, reflect the variety and scope of modern economic analysis. New results are presented in econometric estimation, the theory of aggregation, poverty measurement and the general theory of measurement in economics. The volume is distinguished by the inclusion of the discussion which occurred as each paper was presented, so capturing the interaction and exchange of ideas that characterised the conference.

Originally published in 1951, this volume reprints the classic work written by one of the leading global econometricians. Econometrics is structured as followed: Part 1 explains the relationship of Econometrics to Economics and Statistics. Part 2 outlines the process of formulating economic hypotheses mathematically and of subjecting them to a statistical test. Part 3 deals with the various component equations of the economic system - the psychic reactions, technical relations and reactions of business life and describes the process of setting up an economic model of the system as a whole. Part 4 llustrates the use of econometric methods for policy purposes.

This volume links the abstract theory of demand with its econometric implementation. Exercises lead the reader from elementary utility maximization to the most sophisticated recent techniques, highlighting the main steps in the historical evolution of the subject. The first part presents a brief discussion of duality and flexible forms, and in particular of Deaton and Muellbauer's ``almost ideal demand system''. Part two includes the author's work on true wage indexes, and on intertemporal utility maximization.

Professor Green discusses the definition of consistent aggregation and the problem of grouping variables in a single equation; he deals with the aggregation of equations and the probable errors; and summarizes, with reference to the text, the considerations involved in selecting an appropriate form of aggregation. The author's survey presents a well-balanced overview and analysis of aggregation, and makes readily accessible for the first time much material otherwise difficult to obtain. Originally published in 1964. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

PREFACE TO THE COLLECTION PREAMBLE The editors are pleased to present a selection of Henri Theil's contributions to economics and econometrics in three volumes. In Volume I we have provided an overview of Theil's contributions, a brief biography, an annotated bibliography of his research, and a selection of published and unpublished articles and chapters in books dealing with topics in econometrics. Volume II contains Theil's contributions to demand analysis and information theory. Volume III includes Theil's contributions in economic policy and forecasting, and management science. The selection of articles is intended to provide examples of Theil's many seminal and pathbreaking contributions to economics in such areas as econometrics, statistics, demand analysis, information theory, economic policy analysis, aggregation theory, forecasting, index numbers, management science, sociology, operations research, higher education and much more. The collection is also intended to serve as a tribute to him on the occasion of his 68th birthday: These three volumes also highlight some of Theil's contributions and service to the profession as a leader, advisor, administrator, teacher, and researcher. Theil's contributions, which encompass many disciplines, have been extensively cited both in scientific and professional journals. These citations often place Theil among 10 researchers (ranked according to number of times cited) in the world in various the top disciplines.