This volume collects theoretical papers on the labor market effects of international trade that Udo Kreickemeier has published, together with different co-authors, over the past decade. Many contributions contained in this volume feature labor market imperfections that give rise to involuntary unemployment, and in those contributions, the question of how trade affects aggregate employment typically takes center stage in the analysis. Another recurring theme in many papers is the link between international trade and the income distribution within countries. The channels explored in the different papers include union wage premia, exporter wage premia due to firm-level rent sharing, and ability premia to entrepreneurs that are able to capitalize on their high productivity in global markets.