Influencer marketing is a large and growing but mostly unregulated industry. We document the existence and study cartels of influencers. Using a novel dataset of Instagram influencer cartels, we confirm that the cartels increase engagement as intended. But we also show that engagement from...

Do contributions to online content platforms induce a feedback loop of ever more user-generated content or will they discourage future contributions? To assess this, we use a randomized field experiment which added content to some pages in Wikipedia while leaving similar pages unchanged. We find...

We document a causal influence of online user-generated information on realworld economic outcomes. In particular, we conduct a randomized field experiment to test whether additional information on Wikipedia about cities affects tourists' choices of overnight visits. Our treatment of adding...

Media is critical for gender equality. I analyze Wikipedia, one of the prominent examples of new media. Using data from a survey and a randomized survey experiment, I study why women are less likely to contribute to Wikipedia, the implications of the gender gap on Wikipedia’s content, and what...

The paper estimates the causal impact of retirement on the healthiness of food purchases. The identification strategy uses early and full retirement ages as instruments for retirement. Using household-level scanner data, I find that retirement increases fruit and vegetable purchases and overall...

Restrictions on alcohol sales hours or days are commonly used tools in order to reduce alcohol consumption. However, a forward-looking consumer can buy in advance, and thereby mostly undo the impact of the restriction. I study whether time inconsistent consumer preferences can provide a...

How malleable is alcohol consumption? Specifically, how much is alcohol consumption driven by the current environment versus individual characteristics? To answer this question, we analyze changes in alcohol purchases when consumers move from one state to another in the United States. We find...

How malleable is alcohol consumption? Specifically, how much is alcohol consumption driven by the current environment versus individual characteristics? To answer this question, we analyze changes in alcohol purchases when consumers move from one state to another in the United States. We find...