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Marriage is a core institution in almost every human society, including smallscale societies based on foraging or subsistence agriculture. A crucial dimension of the marriage systems in such societies involves endogamy and exogamy: that is, the choice of a marriage partner from within one's own community or from an outside community. We develop a model in which the exogamy rate is higher when good local matches are scarce due to small community sizes, and when productivity differs acrossdoi:10.1111/ecin.12321 fatcat:sbippv7on5hmrg6mh63ww56n2a