A large literature explores whether asset returns comove in excess of what can be explained by fundamentals, thus suggesting the existence of frictions or behavioral biases. However, we show that comovement is a ubiquitous feature of asset returns that will arise in the presence of latent or...

In 2013, the global mobile app market was estimated at over US $50 billion and is expected to grow to $150 billion in the next 2 years. In this paper, we build a structural econometric model to quantify the vibrant platform competition between mobile (smartphone and tablet) apps on the Apple iOS...

This paper estimates a theory-guided gravity equation of regional patient ows. In our model, a patient's choice to consult a physician in a particular region depends on a measure of spatial accessibility that accounts for the exact locations of both patients and physicians. Introducing this...