I study the effects of a tax on ride-sharing trips in Chicago, which was nominally motivated by a desire to reduce congestion, but which also affected competition between ride-sharing platforms and traditional taxis. I find that platforms passed through more than 100% of the tax to consumers...

Some argue that large platforms, such as Alphabet/Google, Amazon, Apple, Facebook and Microsoft (or GAFAM), are unusual in their number, pace and concentration of technology mergers, with the potential to harm market competition. Using a unique taxonomy developed by S&P Global Market...

Some argue that large platforms, such as Alphabet/Google, Amazon, Apple, Facebook and Microsoft (or GAFAM), are unusual in their number, pace and concentration of technology mergers, with the potential to harm market competition. Using a unique taxonomy developed by S&P Global Market...

We examine how public firms listed in North American stock exchanges acquire technology companies during 2010-2020. Combining data from S&P, Refinitiv, Compustat, and CRSP, and utilizing a unique S&P taxonomy that classifies tech M&As by tech categories and business verticals, we show that 13.1%...

Mergers and acquisitions (M&A) provide an important way for firms to expand technologically. In this paper, we examine how public firms listed in North American stock exchanges acquire technology companies during 2010-2020. Combining data from Compustat, CRSP, Refinitiv, and S&P on M&A, and...

Industries with significant scale economies or learning-by-doing may come to be dominated by a single firm. Economists have studied how likely this is to happen, and whether it is efficient, using models where buyers are price or quantity takers, even though these industries are often also...