Why do so few people use fertilizer even though it can considerably improve yields? This project measures the increase in yield due to fertilizer and hybrid seed use in Western Kenya. It found that fertilizer is profitable, and providing information goes part of the way towards increasing fertilizer adoption. Programs that help farmers commit when they have money to use fertilizer in the future have a very large impact on fertilizer adoption. 

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Despite expanding access to sanitary options such as community toilets, many individuals, especially in urban slums, continue to practice open defecation. One potential explanation is that open defecation has become an ingrained habit.
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Highlighting the importance of carrying correct change helped firms to change their behavior and increase profits.

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How important are differences of opinion within the household for making financial decisions? In this study, married couples in rural Kenya were given the opportunity to open joint and individual bank accounts at randomly assigned interest rates. Researchers assessed if couples with different preferences worked together to save in the highest return account, or if these differences led to poor financial choices.

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Trade credit, which is usually provided by up-stream suppliers to down-stream firms, can help small businesses to purchase non-perishable goods for resale and free up resources for other uses. However, provision of trade credit may be limited by high transaction costs, up-stream liquidity constraints, and concerns over repayment.

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Throughout the developing world, the family owned business is the most common form of enterprise. Though these types of businesses are prevalent, there is tremendous heterogeneity in the success of such firms. For instance, in the retail sector, some firms hold large inventories and earn significant profits, while others hold minimal stocks and provide little more than subsistence income for their owners.

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The majority of people living in Sub-Saharan Africa do not have access to electricity. Traditional power companies often find it too costly to bring electricity to rural and suburban areas, but in recent years, the cost of alternative energy sources like solar power has fallen dramatically.

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The vast majority of new HIV infections occur in sub-Saharan Africa, where nearly 2 million people become infected with HIV/AIDS every year. This randomized evaluation examines the impact of two HIV prevention strategies among youth in Kenya: voluntary counseling and testing for HIV (VCT) and condom distribution.

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Does linking teachers' pay to students' test performance improve educational outcomes, or just increase “teaching to the test”? This study examines the effects of a teacher incentives program on both teacher behavior and student test scores in Kenya. Student test scores increased significantly during the study period, but evidence suggests that this improvement came through test-preparation sessions outside of normal class hours.

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