Introduction / Josh Lerner and Antoinette Schoar -- International perspectives on the nature of entrepreneurship -- Explaining international differences in entrepreneurship: the role of individual characteristics and regulatory constraints / Silvia Ardagna and Annamaria Lusardi -- Who are the...

There has been a recent surge of interest in open source software development, which involves developers at many different locations and organizations sharing code to develop and refine programs. To an economist, the behavior of individual programmers and commercial companies engaged in open...

Time preference is a key determinant of occupational choice and investments in human capital. Since careers are characterized by different wage growth prospects, individual discount rates play an important role in the relative valuation of jobs or occupations. We predict that individuals with...

This paper studies the forces which determine how diversity at a firm evolves over time. We consider a dynamic model o a single firm with two levels of employees, the entry level and the upper level. In each period, the firm selects a subset of the entry-level workers for promotion to the upper...

This paper studies career concerns -- concerns about the effects of current performance on future compensation -- and describes how optimal incentive contracts are affected when career concerns are taken into account. Career concerns arise frequently: they occur whenever the market uses a...