The fifth Summer Symposium in Economic Theory will take place at the Studienzentrum in Gerzensee, Switzerland. Over the course of two weeks, forty European economists will have the chance to interact and present work-in-progress on an informal basis. There will be three half-day workshops on Political Economy chaired by Roger Myerson, Torsten Persson, Howard Rosenthal and a focus session on the Economics of Agglomeration led by Jacques Thisse and Vernon Henderson.