Eds. Orley Ashenfelter, David Card. What factors affect the ways individuals participate in labor markets? "New Developments and Research on Labor Markets" (volume 4A/B) proposes answers to this and other questions on important topics of public policy. Leading labor economists demonstrate how better data and advanced experiments help them apply economic theory, yielding sharper analyses and conclusions. The combinations of these improved empirical findings with new models enable the authors of these chapters to reveal how labor economists are developing new and innovative ways to measure key parameters and test important hypotheses. This title concentrates on empirical research in specific labor markets, including those defined by age, gender, and race. It reveals how questions and answers about these markets have changed and how models measure them. It documents how conceptual models and empirical work explain important practical issues.