Read the article by Hoyt Bleakley, "Disease and Development: Evidence from Hookworm Eradication in the American South," The Quarterly Journal of Economics 122, no. 1 (2007): 73-117. Compare the method he uses to evaluate the effect of hookworm eradication with that used by Edward Miguel and Michael Kremer discussed in this chapter. What differences do you observe between the two methodologies? What information does Bleakley use to estimate the effect of deworming campaigns?