We partnered with Walmart to test 22 nudges designed to boost vaccination rates in their pharmacies. Nudges were delivered via text message to over 650,000 Walmart pharmacy patients in the fall of 2020 and encouraged patients to visit Walmart for a flu vaccine. We demonstrate that behaviorally...

When two people coincidentally have something in common (such as a name or birthday), they tend to like each other more and are thus more likely to offer help and comply with requests. This dynamic can have important legal and ethical consequences whenever these incidental similarities give rise...

In hopes of motivating consumers to provide larger volumes of useful reviews, many retailers offer financial incentives. Here, we explore an alternative approach, social norms, wherein we inform people about the volume of reviews authored by peers. We test the effectiveness of using financial...

Do parents favor some children over others? The overwhelming majority of parents state that they treat their children equally, but parents rarely track their spending on each child. We investigate in four studies whether mothers and fathers favor specific children depending on the biological sex...