We conduct an experiment where subjects read online news articles and are shown ads for brands next to those articles. Using eye-tracking technology, we measure the attention that each individual devotes to each article and ad. Then, respondents choose between cash or vouchers for the brands...

This paper studies how restricting data exchange between firms affects market competition in the app economy. The identification exploits iOS's privacy policy update, which limits apps from tracking users across other apps using identifiers. We find that the iOS update reduces startup app...