Perhaps the most striking feature of "crowdfunding" is the broad geographic dispersion of investors in small, early-stage projects. This contrasts with existing theories that predict entrepreneurs and investors will be co-located due to distance-sensitive costs. We examine a crowdfunding setting...

Perhaps the most striking feature of "crowdfunding'' is the broad geographic dispersion of investors. This contrasts with existing theories that predict entrepreneurs and investors will be co-located due to distance-sensitive costs. We examine a crowdfunding setting that connects...

"Perhaps the most striking feature of "crowdfunding" is the broad geographic dispersion of investors in small, early-stage projects. This contrasts with existing theories that predict entrepreneurs and investors will be co-located due to distance-sensitive costs. We examine a crowdfunding...

This paper explores the international dimensions of the economics of artificial intelligence. Trade theory emphasizes the roles of scale, competition, and knowledge creation and knowledge diffusion as fundamental to comparative advantage. We explore key features of AI with respect to these...

There is a well-documented a "digital divide" in internet connection. We ask whether a similar divide exists for internet usage. Using a survey of 18,439 Americans, we find that high-income, educated people were more likely to have adopted the internet by December 2001. However, conditional on...

We show that gravity holds in the case of digital goods that are consumed over the Internet and have no trading costs. Therefore, trade costs, although possibly important, cannot account for the effects of distance on trade. In particular, we show that Americans are more likely to visit websites...

The growing peer effects literature pays particular attention to the role of stars. We decompose the causal effect of hiring a star in terms of the productivity impact on: 1) co-located incumbents and 2) new recruits. Using longitudinal university department-level data we report that hiring a...

We report a puzzling pair of facts concerning the organization of science. The concentration of research output is declining at the department level but increasing at the individual level. For example, in evolutionary biology, over the period 1980 to 2000, the fraction of citation-weighted...