内容提要: 知识溢出是解释集聚, 创新和区域经济增长的重要概念之一. 20 世纪90 年代以来,
知识溢出的研究单元从企业转向了空间, 在城市与区域空间范围内对其进行了深入的研究 …

There is a large literature on the productivity of universities. Little is known, however, about
how different types of leader affect a university's later performance. To address this, I blend …

Conditional Cash Transfer (CCT) programs aim to reduce poverty by making welfare
programs conditional upon the receivers' actions. That is, the government only transfers the …

Empirical research on cities starts with a spatial equilibrium condition: workers and firms are
assumed to be indifferent across space. This condition implies that research on cities is …

By David Card* major US cities. The appeal of this research design is illustrated in Table 1,
which presents recent data on immigrant densities, education outcomes, and mean salaries …

We study peer effects in the workplace. Specifically, we investigate whether, how, and why
the productivity of a worker depends on the productivity of coworkers in the same team …

The chronic underinvestment in higher education has serious ramifications for both
individuals and society. Winner, Best Book in Education, 2009 PROSE Awards, Professional …

Much of the inequality literature has focused on national inequality, but local inequality is
also important. Crime rates are higher in more unequal cities; people in unequal cities are …

This paper documents the allocation of skills across cities and estimates the impact of
agglomeration on the hedonic prices of worker skills. We find that large cities are more …

In 1961, Benjamin Chinitz described Pittsburgh and New York City as 'contrasts in
agglomeration'. While New York City appeared to be full of independent entrepreneurs …