No–poaching clauses (NPCs) have recently come under scrutiny due to their potentially anti–competitive impact on wages. However they can also enhance efficiency. We use data from the US chain restaurant industry to assess the effect of such clauses on wages and we find robust evidence of a...

Understanding what determines firm boundaries and the choice between interacting in a firm or a market is not only the fundamental concern of the theory of the firm, but it is also one of the most important issues in economics. Data on value added, for example, reveal that in the US,...

We simultaneously assess the contributions to productivity of three sources of research and development spillovers: geographic, technology and product-market proximity. To do this, we construct a new measure of geographic proximity that is based on the distribution of a firm's inventor locations...

We review important developments in Empirical Industrial Organization (IO) over the last three decades. The paper is organized around six topics: collusion, demand, productivity, industry dynamics, interfirm contracts, and auctions. We present models that are workhorses in empirical IO, and...