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Acknowledgements
I thank Virginia Aguirre Muñoz, Kathleen Coll, Sabina Leonelli, Sergio Martínez, and Michael Wade for discussion concerning some of these issues. A number of years ago, Elihu Gerson inspired me to study the Chicago Groups; alas, until now, I never wrote up even the preliminary results of my research. I thank the organizer of the 2004 London School of Economics conference and managing editor of GJSS, Sabina Leonelli, for strongly encouraging me to send in an abstract to the conference and for many intellectual discussions.