Collective Preference And Choice

A study of the classical aggregation problems that arise in social choice theory, voting theory, and group decision-making under uncertainty.

A study of the classical aggregation problems that arise in social choice theory, voting theory, and group decision-making under uncertainty.

A definitive, comprehensive, and analytically sophisticated treatment of the theory of collective preference

When one thinks about how collective decisions are made, voting is the method that comes naturally to mind. But other methods such as random process and consensus are also used. This book explores just what a collective decision is, classifies the methods of making collective decisions, and identifies the advantages and disadvantages of each method. Classification is the prelude to evaluation. What are the characteristics of a method of making collective decisions, the book asks, that permit us to describe a collective decision as good? The second part of the book is detailed exploration of voting: the dimensions in which voting situations differ, the origins and logic of majority rule, the frequency of cycles in voting, the Arrow and Gibbard-Satterthwaite theorems, criteria for ways of cutting through cycles and the application of these criteria to a variety of rules, voting over continuums, proportional representation, and voting rules that take account of intensities of preferences. Relatively unknown methods of voting give voting a much greater potential than is generally recognized. Collective Decisions and Voting is essential reading for everyone with an interest in voting theory and in how public choices might be made.

An examination of the phenomenon of social cooperation failure, even amongst a group of rational individuals.

This book is concerned with the study of collective preference, in particular with the relationship between the objectives of social action and the preferences and aspirations of society's members. Professor Sen's approach is based on the assumption that the problem of collective choice cannot be satisfactorily discussed within the confines of economics. While collective choice forms a crucial aspect of economics, the subject pertains also to political science, the theory of the state, and to the theory of decision procedures. The author has therefore used material from these disciplines, plus philosophical aspects from ethics and the theory of justice.

Since so few people appear knowledgeable about public affairs, one might question whether collective policy preferences revealed in opinion surveys accurately convey the distribution of voices and interests in a society. This study, the first comprehensive treatment of the relationship between knowledge, representation, and political equality in opinion surveys, suggests some surprising answers. Knowledge does matter, and the way it is distributed in society can cause collective preferences to reflect disproportionately the opinions of some groups more than others. Sometimes collective preferences seem to represent something like the will of the people, but frequently they do not. Sometimes they rigidly enforce political equality in the expression of political viewpoints, but often they do not. The primary culprit is not any inherent shortcoming in the methods of survey research. Rather, it is the limited degree of knowledge held by ordinary citizens about public affairs. Accounting for these factors can help survey researchers, journalists, politicians, and concerned citizens better appreciate the pitfalls and possibilities for using opinion polls to represent the people s voice.

This textbook provides a survey of the literature of social choice. It integrates the ethical aspects of the subject, (discussing potentially desirable conditions for social judgements) with positive aspects of decision mechanisms that centre on the revelation of true preferences. The literature on the subject presently consists of a great many papers. This book draws them together in common notation and points out interpretations which are often missing in specialist papers. Applications in economics, electoral politics, and ethics are discussed. The book will be used by senior undergraduate and graduate students of economics, political science and philosophy as a text book in the subject.