Why Didn’t the College Premium Rise Everywhere? Employment Protection and On-the-Job Investment in Skills
研究了自1980年代以来美国大学工资溢价快速上升而德国等欧洲经济体未出现同样现象的原因，认为就业保护差异是关键，并通过模型说明就业保护促进长期匹配和技能投资。
Why has the college wage premium risen rapidly in the United States since the 1980s but not in European economies such as Germany? We argue that differences in employment protection can account for much of the gap. We develop a model in which firms and workers make relationship-specific investments in skill accumulation. The incentive to invest is stronger when employment protection creates an expectation of long-lasting matches. We argue that changes in the economic environment have reduced relationship-specific investment for less educated workers in the United States, but not for better-protected workers in Germany.