Social Welfare and Collective Goods Coercion in Public Economics by Stanley L. Winer a , George Tridimas b and Walter Hettich c January 27, 2007 Earlier versions were presented at Bar Ilan University, the IIPF Congress, Paphos, The National Tax Association, Boston, Queen's University and the University of Eastern Piedmont. We are indebted for comments by Alberto Cassone, Thomas Dalton, Mario Fererro, Arye Hillman, Sebastien Kessing, Carla Marchese, Pierre Pestieau, Dan Usher and David Wildasin. Errors and omissions remain the responsibility of the authors. a : School of Public Policy and Administration and Department of Economics, Carleton University, Ottawa, Canada K1S5B6. Tel: (613)520-2600 ext.2630. Fax: (613)520-2551. E-mail: stan_winer@carleton.ca ; b : School of Economics and Politics, University of Ulster, Shore Road, Newtownabbey, Co. Antrim BT37 0QB, UK Tel.: +44(0)28 90368273; Fax: +44 (0) 28 90 366847. E-mail: G.Tridimas@ulster.ac.uk ; c : Department of Economics, California State University, Fullerton, E-mail: whettich@fullerton.edu . Winer's research is supported by the Canada Research Chair program. He is also indebted to the International Center for Economic Research, Turin and the Center for Economic Studies, Munich.