1 On the Viability of Monetary Complementarity in Federations: the Case of Fiscal Provincial Monies in 2001-2003 Argentina’s Crisis Bruno Théret, CNRS – IRISSO, université Paris Dauphine, France theret@dauphine.fr and Miguel Zanabria Universidad Quilmès, Argentina (first draft) Contribution to the session “Revisiting Money as a Unified Unit of Account from a Complementary Viewpoint”, XV th World Economic History Congress, Utrecht University – International Institute of Social History, Utrecht, 3-7 août 2009.