Using documents previously unavailable in English, the authors present a cohesive and original picture of French economic thought that solidly documents the contributions of Dupuit and his colleagues. Ekelund and Hebert build their argument by focusing on the development of economic theory in the peculiar milieu of postrevolutionary France in an attempt to identify the essence of the French contribution and the extent to which the French legacy benefited other economists of international acclaim. They conclude that the kinds of issues in economic theory and policy that Dupuit and his colleagues found arresting and worthy of analysis in the nineteenth century are still pertinent today and will continue to interest economists into the twenty-first century. This seminal work will be of great importance to historians of economics and all economists interested in the foundations of modern microeconomics.