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Researchers tested whether an informative letter campaign could reduce inappropriate prescribing of controlled substances in Medicare Part D. Letters had no detectable effect on prescribing. In ongoing work, researchers are testing alternative versions of letters.

Researchers conducted a randomized evaluation in Colombia to assess the effects of emergency cash assistance on the well-being of households. Recipients of the UCT experienced improved financial health, food access, and psychological well-being. Colombia’s newly implemented mobile money system...

In the United States, many people who are eligible for social and economic benefits do not claim those benefits. Researchers partnered with the U.S. Internal Revenue Service (IRS) to test the effectiveness of different messages to taxpayers designed to encourage them to claim certain tax benefits.

Across six randomized evaluations, researchers studied the impact of low-cost, low-touch informational interventions, or “nudges,” on take-up of the federal and state Earned Income Tax Credit (EITC) in California. None of the interventions had an impact on EITC take-up, suggesting that information...

In partnership with the Government of Tamil Nadu, researchers evaluated the impact of incentivizing and monitoring walking on exercise and health. Incentives increased walking and improved health, as measured by risk factors for diabetes and by mental health.

In low- to middle-income countries around the world, nearly one billion people lived in urban informal settlements as of 2018. Rapid urbanization in most large African cities has led to both more people and a higher proportion of people living in informal settlements over time. Researchers conducted...

In partnership with the Government of Indonesia, researchers conducted a randomized evaluation to compare the efficacy of vouchers versus in-kind transfers in reducing poverty and improving program delivery. The reform led to an increase in assistance received by eligible households, due to improved...