The book introduces the reader to the now largely standard Mortensen-Pissarides (1994) matching model of the labor market, and then builds a number of applications of this model that allow us to study the distributional effects of various labor market policies and institutions. For each of those institutions, the effect on the welfare of different kinds of workers is computed. The institutions that are studied are in turn : employment protection, unemployment benefits, and active labor market policies. The analysis highlights the key role played by wage formation in affecting the distribution of gains and losses from those institutions. The book helps the student mastering the tools of contemporary matching models, and understanding the conflicts of interests between various categories of workers over the design of labor market institutions.