Paola Tubaro, EconomiX, Université Paris X-Nanterre, Bâtiment K, Bureau K 131, 200, Avenue de la République, F-92001 Nanterre cedex, France. Erik Angner, Department of Philosophy and Department of Finance, Economics, and Quantitative Methods, University of Alabama at Birmingham, HB414A, 1530 3rd Ave. S., Birmingham, AL, 35294-1260, USA. This symposium took place at the Annual Meeting of the European Society for the History of Economic Thought (ESHET) in Porto, Portugal, on April 29, 2006. We are grateful to ESHET, especially Pascal Bridel and Annalisa Rosselli, for generously assisting us logistically and financially in the organization of the symposium. The two symposium papers not included here are “In Search of a Definition for the History of Economic Thought,” by Rebeca Gomez Betancourt and Alexander Tobon, and “The Importance of the Analysis of Economic Problems from the Perspective of the History of Economic Thought,” by Marta Sora.