We study a model of strategic interaction between producers and a monopolist platform that employs a recommendation system. We characterize the consumer welfare implications of the platform’s entry into the production market. Upon entry, the platform biases recommendations to steer consumers...

Widely discredited ideas nevertheless persist. Why do we fail to "unlearn"? We study one explanation: beliefs are resistant to retractions (the revoking of earlier information). Our experimental design allows us to identify updating from retractions - unlearning - and to compare it with updating...

To investigate how public finances could best be designed to promote long-run growth and address inequality, it is essential to have comprehensive, cross-country comparable data on government spending and revenues, along with structural and policy indicators. By identifying key variables of...

We estimate the causal impact of a 2018 zoning reform that banned new short-term rental registries in some parts of Lisbon. The short-term rental licence expires when the house is sold, hence the ban removes the option value of short-term renting a property. We rely on two administrative data...

We conduct a field experiment on a movie-recommendation platform to identify if and how recommendations affect consumption. We use within-consumer randomization at the good level and elicit beliefs about unconsumed goods to disentangle exposure from informational effects. We find recommendations...

We study a model in which two players with opposing interests try to alter a status quo through instability-generating actions. We show that instability can be used to secure longer-term durable changes, even if it is costly to generate and does not generate short-term gains. In equilibrium,...

This article arose while working on the rhino poaching problem in South Africa and having to deal with the large number of stakeholders and complexity. The purpose of actor modelling is to develop a deeper understanding of how stakeholders and threats contribute to the complex security problems....

We estimate the causal impact of a 2018 zoning reform that banned new short-term rental registries in some parts of Lisbon. The short-term rental licence expires when the house is sold, hence the ban removes the option value of short-term renting a property. We rely on two administrative data...

We conduct a field experiment on a movie-recommendation platform to identify if and how recommendations affect consumption. We use within-consumer randomization at the good level and elicit beliefs about unconsumed goods to disentangle exposure from informational effects. We find recommendations...