?:authorAffiliation
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[\'Department of Economics, Stanford University, Stanford, CA 94305.\', \'Abdul Latif Jameel Poverty Action Lab (J-PAL), Cambridge, MA 02142.\', \'National Bureau of Economic Research (NBER), Cambridge, MA 02138.\', \'Yale School of Management, Yale University, New Haven, CT 06511.\', \'Department of Economics, Stanford University, Stanford, CA 94305; jacksonm@stanford.edu.\', \'Santa Fe Institute, Santa Fe, NM 87501.\', \'Applied Mathematics, Harvard University, Cambridge, MA 02138.\']
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