Due to a last-minute fight among the candidates, Vox, a party at the right end of the Spanish political spectrum, could not run in Santa Cruz de Tenerife, a relatively representative electoral constituency, in the general election of July 23, 2023. Since this fight was a power struggle within...

Due to a last-minute fight among the candidates, Vox, a party at the right end of the Spanish political spectrum, could not run in Santa Cruz de Tenerife, a relatively representative electoral constituency, in the general election of July 23, 2023. Since this fight was a power struggle within...

Over 2 billion people lack clean drinking water. Existing solutions face high costs (piped water) or low demand (point-of-use chlorine). Using a 60,000 household cluster-randomized experiment we test an increasingly popular alternative: decentralized treatment and home delivery of clean water to...

How does early educational quality affect longer-term academic outcomes? We shed light on this question via a natural experiment in the Philippines--the implementation of a mother tongue education policy in public schools in kindergarten to Grade 3. This policy led to an unexpected decline in...

This chapter is intended as an introduction to laboratory experiments, when to use, how to evaluate them, why they matter and what are the pitfalls when designing them. I hope that users as well as consumers will find Sections that broaden their views. I start with when an economist might want...

We experimentally test two seminal hypotheses on the impact of competition on firms' management upgrading. In a first experiment, we protect firms from labor market competition by reducing the risk that a freshly trained manager would be poached by a rival firm. We find that this protection does...