In 2020, the Department of Justice (DOJ) filed an antitrust suit against Google alleging that Google has unlawfully monopolized the markets for general search services, search advertising, and general search text advertising. The complaint raises questions involving market definition, monopoly...

I document the evolution of market power in the U.S. airline industry for the period 1990:Q1-2019:Q4. I recover estimates of markups, defined as the ratio of price to marginal cost, at the airline-time level. Dominant carriers in the industry have substantially increased their markups in the...

I assess the effect of recent U.S. airline mergers on productive efficiency and market power. I recover productivity, markup, and marginal cost estimates for each airline using production and cost data. I then employ these estimates, a panel event study design, and synthetic control methods to...

This paper analyzes the effects of increased shared computer access in secondary schools in Peru. Administrative data are used to identify, through propensity-score matching, two groups of schools with similar observable educational inputs but different intensity in computer access. Extensive...

This paper analyzes the effects of increased shared computer access in secondary schools in Peru. Administrative data are used to identify, through propensity-score matching, two groups of schools with similar observable educational inputs but different intensity in computer access. Extensive...