Mark Cherry’s Kidney for Sale by Owner is a book that illustrates how to do applied ethics right. Mark Cherry recognizes the important role of empirical facts in bridging a gap between our moral prescriptions, and our public policy or institutional prescriptions. In Kidney for Sale by Owner this method is on full display. While there is nothing the matter with Ideal Theory, we stand in need of what might be called bridge principles between the ideals of justice and some specific set of institutions that, we intend and hope, will actually realize those ideals. The bridge between Ideal and Actual will consist of empirical facts that require the tools of the social scientists.