Politics as exchange: the classical liberal economics and politics of James M. Buchanan

James Buchanan advocated the market mechanism for allocating resources because it is based on voluntary exchange. People engage in market transactions only when they believe they benefit from doing so. Buchanan depicted the political process the same way. People engage in collective activities to accomplish together ends that they would be unable to accomplish individually, or through bilateral exchange. Buchanan's vision of politics as exchange is a normative framework for evaluating the rules within which political activity takes place. Rules that meet the criterion of agreement are desirable constitutional rules, and Buchanan recognized that not all government activity satisfies that criterion. Buchanan is the father of the subdiscipline of constitutional political economy, and his "politics as exchange'' approach provides the foundation for much work in that area. Buchanan has created a foundation that is rich in ideas, but leaves behind a number of unanswered questions that point the way toward a further development of the research program in constitutional political economy.