This chapter provides a comprehensive expository survey and synthesis of the theoretical determinants of migration. Early work beginning with Adam Smith, running through the pioneering research of Larry Sjaastad in the 1960s, and continuing through the end of the twentieth century established...

The H-1B program allows firms in the United States to temporarily hire high-skilled foreign citizens. H-1B workers are highly concentrated among a small number of firms. We develop a theoretical model demonstrating that this phenomenon is an artifact of policy design: When the government...

Empirical evidence illustrates that diversity generates both economic costs and benefits. This paper develops a theoretical model that accounts for the positive and deleterious effects of heterogeneity. First, an expanded Solow Growth Model demonstrates that the direct effects of diversity can...