作者：Porteous, Obie
作者单位：Middlebury College
摘要：The incentives for and effects of widespread technology adoption depend on the trade costs separating producers from input and output markets. I incorporate the decision to adopt imported fertilizer into a model of agricultural trade between 230 regional markets across sub-Saharan Africa. I then evaluate two alternative approaches to promoting technology adoption: lowering trade costs and subsidizing fertilizer. Whereas trade cost reduction shifts production towards the most productive regions...
作者：Dustan, Andrew
作者单位：Vanderbilt University
摘要：This paper estimates the effects of a massive, minimally targeted conditional cash transfer program in Mexico City's public high schools on graduation rates, test scores, and school choice. Using a difference-in-differences approach that exploits variation in eligibility between students and cohorts within a high school, I find that this program had no appreciable effect on high school completion. The results are sufficiently precise to rule out policy-relevant effect sizes. Null effects persi...
