NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Bram Thuysbaert

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Working Papers

August 2014Self-Selection into Credit Markets: Evidence from Agriculture in Mali
with Lori Beaman, Dean Karlan, Christopher Udry: w20387
We partnered with a micro‐lender in Mali to randomize credit offers at the village level. Then, in no- loan control villages, we gave cash grants to randomly selected households. These grants led to higher agricultural investments and profits, thus showing that liquidity constraints bind with respect to agricultural investment. In loan-villages, we gave grants to a random subset of farmers who (endogenously) did not borrow. These farmers have lower – in fact zero – marginal returns to the grants. Thus we find important heterogeneity in returns to investment and strong evidence that farmers with higher marginal returns to investment self-select into lending programs.
November 2013Targeting ultra-poor households in Honduras and Peru
with Dean Karlan: w19646
For policy purposes, it is important to understand the relative efficacy of various methods to target the poor. Recently, participatory methods have received particular attention. We examine the effectiveness of a hybrid two-step process that combines a participatory wealth ranking and a verification household survey, relative to two proxy means tests (the Progress out of Poverty Index and a housing index), in Honduras and Peru. The methods we examine perform similarly to one another by various metrics. They all target most accurately in the cases of the poorest and the wealthiest households but perform with mixed results among households in the middle of the distribution. Ultimately, given similar performance, the analysis suggests that costs should be the driving consideration in choosin...
February 2013Profitability of Fertilizer: Experimental Evidence from Female Rice Farmers in Mali
with Lori A. Beaman, Dean Karlan, Christopher R. Udry: w18778
In an experiment providing fertilizer grants to women rice farmers in Mali, we found that women who received fertilizer increased both the quantity of fertilizer they used on their plots and complementary inputs such as herbicides and hired labor. This highlights that farmers respond to an increase in availability of one input by re-optimizing other inputs, making it challenging to isolate the returns to any one input. We also found that while the increase in inputs led to a significantly higher level of output, we find no evidence that profits increased. Our results suggest that fertilizer's impact on profits is small compared to other sources of variation. This may make it difficult for farmers to observe the impact of fertilizer on their plots, and accordingly this affects their ability...

Published: Lori Beaman & Dean Karlan & Bram Thuysbaert & Christopher Udry, 2013. "Profitability of Fertilizer: Experimental Evidence from Female Rice Farmers in Mali," American Economic Review, American Economic Association, vol. 103(3), pages 381-86, May. citation courtesy of

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