Simple, easy-to-implement tax reminder messages are an effective way of raising revenues in low-compliance contexts

Reminding businesses that tax authorities are watching does increase tax revenue collected, but only while the intervention lasts

Optimising the assignment of tax collectors significantly increases tax revenue and compliance at little or no added cost

Centralised procurement by the public sector leads to lower drug prices, but the price reduction is smaller when the supply side is more concentrated

In settings with market power, providing goods directly can generate larger consumer surplus gains than cash and vouchers because of price effects

Interventions aimed at alleviating multiple constraints are often needed to achieve the desired impact

An experiment in Pakistan finds that training decision makers in the benefits of empathy cultivates prosocial behaviour in the lab and the field

Cash transfers raised food prices and increased stunting among children from ineligible households in remote and poor areas

Increasing property taxes can boost revenues for developing countries, but enforcement may threaten the welfare of liquidity-constrained households