The most remote villages in Northern Tanzania pay 40–55% more for fertiliser than villages with better market access. Halving travel costs leads to a nearly fourfold increase in fertiliser adoption.

Self-interviewing survey techniques substantially increase reported levels of intimate partner violence, but this may be driven by respondents’ misunderstanding

Providing small financial incentives for daily steps to at-risk individuals in India encouraged exercise and improved health

Cash transfers improve food security for up to two years, but without an increase in food expenditures and non-agricultural income

Improving access to saving tools helps urban Malawian microentrepreneurs save and adjust labour supply decisions

Bundling payment incentives over time is more effective in increasing effort among the impatient, relative to increasing payment frequency