One of the things Fogels work does is to remind us constantly that (economic) efficiency need not tell us anything about the morality or justice of economic arrangements (see his great, great book, Without Consent or Contract).His work on nutrition is also extraordinarily important, and has led to a huge literature.
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Daniel Kuehn is a doctoral candidate and adjunct professor in the Economics Department at American University. He has a master's degree in public policy from George Washington University.