Association between statewide financial incentive programs and COVID-19 vaccination rates.

To promote COVID-19 vaccination, many states in the US introduced financial incentives ranging from small, guaranteed rewards to lotteries that give vaccinated individuals a chance to win large prizes. There is limited evidence on the effectiveness of these programs and conflicting evidence from survey experiments and studies of individual states' lotteries. To assess the effectiveness of COVID-19 vaccination incentive programs, we combined information on statewide incentive programs in the US with data on daily vaccine doses administered in each state.

Exploring Psychology in the Field: Steps and Examples From the Used-Car Market.

The growing availability of large datasets in a variety of domains presents an opportunity for researchers to use field data to better understand psychological concepts. I discuss, from an empirical economics point of view, steps for how to study cognition in large datasets. I use two recent papers that explore psychology in the used-car market as motivating examples.

Reacting to rankings: evidence from "America's Best Hospitals".

Rankings and report cards have become a popular way of providing information in a variety of domains. I estimate the response to rankings in the hospital market and find that hospitals that improve their rank are able to attract significantly more patients. The average hospital in my sample experiences a 5% change in non-emergency, Medicare patient volume from year to year due to rank changes.