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Researchers evaluated the impact of direct mail and phone calls on the turnout of Black voters in ten different states. Neither mailings nor phone calls significantly impacted voter turnout, perhaps due to the large volume of political messaging that voters had to navigate.

In slums near Nairobi, Kenya, researchers are testing how subsidizing the cost of connecting to the sewer system and providing information about the health benefits of improved sanitation affects the number of landlords who connect to the sewer system.

Researchers evaluated a cap-and-trade program in the United States to determine if the initial allocation of permits among firms affected how much firms decided to pollute. Evidence was consistent with, but not proof of, the economic theory that firms make decisions to reduce emissions based on...

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...

Researchers designed an employment program in northern Ghana and evaluated participants’ willingness to engage in paid labor and carry out complex tasks on the job.