Measuring the returns of advertising opportunities continues to be a challenge for many businesses. We design and run a field experiment in collaboration with Yelp across 18,294 firms in the restaurant industry to understand which types of businesses gain more from digital advertising. We...

COVID-19 vaccines are widely available in wealthy countries, yet many people remain unvaccinated. Understanding the effectiveness -- or lack thereof -- of popular vaccination campaign strategies is therefore critical. In this paper, we report results from two studies that tested strategies...

Third-party cookies and related 'offsite' tracking technologies are frequently used to share user data across applications in support of ad delivery. These data are viewed as highly valuable for online advertisers, but their usage faces increasing headwinds. In this paper, we quantify the...

We combine national administrative data on earnings and participation in subsidized housing to study how the demolition of 160 public housing projects--funded by the HOPE VI program--affected the adult labor market outcomes for 18,500 children. Our empirical strategy compares children exposed to...

The invention of new applications based on information and communications technologies (ICTs) has had two economic effects up to now. These applications have transformed production, creating value for applications-inventing companies and their customers and increasing economic growth through...

We report a large-scale randomized controlled trial designed to assess whether the partisan cue of a provaccine message from Donald Trump would induce Americans to get COVID-19 vaccines. Our study involved presenting a 27-second advertisement to millions of U.S. YouTube users in October 2021....

Expenditures on prescription drugs are one of the fastest growing components of national health care spending, rising by almost three-fold between 1995 and 2007. Coinciding with this growth in prescription drug expenditures has been a rapid rise in direct-to-consumer advertising (DTCA), made...