Notes, Comments and Preliminary results Aug 01 2006 Carl Gaigne and Kristian Behrens   Density (dis)economies in transportation: revisiting the core-periphery model   Abstract  Contact Information  Citation  Full Text  -  Note   May 22 2006 Yasuhiro Sato and Kristian Behrens   `Brain drain' without migration: Capital market integration and capital-skill complementarities   Abstract  Contact Information  Citation  Full Text  -  Note