This important contribution to the larger debate of the capitalist system clarifies core economic issues, so that the positive science of economics can enlighten our understanding of justice in capitalist distribution. Successful production always results from the discovery of an opportunity to obtain new gains from trade, i.e., the discovery of entrepreneurial profit. Kirzner shows that profit is the just and fair possession of its discoverer. This is what he calls the “finders-keepers” rule: “The finders-keepers rule asserts that an unowned object becomes the justly owned property of the first person who, discovering its availability and its potential value, takes possession of it.” Richard Ebeling reviewed the work in 1989, saying, “the heart of Professor Kirzner’s argument is that every discovery of a new opportunity is the appropriation of that which had not existed before a human mind had seen the potential in that object.” Kirzner’s monograph is complemented here by three important articles on the subject of economic justice, a critique of Kirzner’s theory, and a reply from Kirzner to that critique. Kirzner’s finders-keepers rule of entrepreneurial profit and market distribution stands as one of the foremost defenses of the distribution of income and profit in the free-enterprise system. Israel M. Kirzner is a leading economist in the Austrian School and Professor Emeritus of Economics at New York University. Peter J. Boettke is UniversityProfessor of Economics and Philosophy at George Mason Universityand the BB&T Professor for the Study of Capitalism at the Mercatus Center. His publications include and . He has been the editor of since 1998. Frédéric Sautet is Associate Professor at The Catholic Universityof America, School of Business and Economics. He is a specialist in Austrian market process theory and teaches entrepreneurship studies. He has taught at George Mason Universityof Paris Dauphine. He is the author of and has published widely on entrepreneurship.