This paper develops an elementary theory of global supply chains. We consider a world economy with an arbitrary number of countries, one factor of production, a continuum of intermediate goods, and one final good. Production of the final good is sequential and subject to mistakes. In the unique...

I estimate the impact of venture capital (VC) on knowledge diffusion by comparing patent citations before and after companies secure VC. I find that a patent's citations increase following VC financing, particularly those made by other companies also financed by the same VC investor....

We introduce and describe a Stata routine weakivtest implementing the test for weak instruments of Montiel Olea and Pflueger (2013). weakivtest allows for errors that are not conditionally homoskedastic and serially uncorrelated. It extends the Stock and Yogo (2005) weak instrument tests...

Ride-sharing platforms face a “productivity paradox”, where any efficiency gained through improved dispatch or pricing strategies will not benefit drivers or riders. We show that this is a limit of the traditional ride-hailing model, and a consequence of the Hall-Horton driver equilibrium...