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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.

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.

More than two billion people around the world lack access to clean drinking water, and current approaches to increasing access have fallen short. Researchers conducted a randomized evaluation to test the impact of delivering clean water directly to households on the valuation of clean water, and...

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.

Researchers evaluated the impact of cognitive behavioral therapy (CBT) and cash transfers on functional impairment (or difficulty performing daily tasks), depression, and food security among adults 55 and older living alone in Tamil Nadu, India. At a three-week follow-up, cash transfers improved...

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...

In Egypt, a sizable portion of the prison population is incarcerated solely for failing to repay private debts, highlighting serious concerns about the social, economic, and legal consequences of debtor imprisonment. Researchers are conducting two randomized evaluations, the first tests the impact...