Foreigners and robots : assistants of some, competitors of others / Edward E. Leamer -- Economic research and the debate over immigration policy / George J. Borjas -- U.S. trade adjustment assistance policies for workers / Gregory K. Schoepfle -- Trade and environmental quality / John J. Kirton -- The role of labor standards in U.S. trade policies / Gary S. Fields -- The simple economics of labor standards and the GATT / Kyle Bagwell and Robert W. Staiger -- A transactions cost politics analysis of international child labor standards / Drusilla K. Brown -- The role of interest groups in the design and implementation of U.S. trade policies / Claude E. Barfield [and others].