Over the past decades, economists have increasingly taken note of the importance of social networks in determining choices and behaviors in a wide variety of settings. More recently, researchers have taken note of the role of network endogeneity--that is, people choosing their peer groups--in informing our understanding of many relationships. This dissertation consists of three chapters that investigate the role of social networks in economics, with a focus on applications in developing-country settings. Chapter 1 derives a new methodology to predict the effects of policies that assign people to groups, while taking account of the fact that actors choose their peers and peers affect outcomes. Chapter 2 investigates the sensitivity of estima...
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