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  1. "For societies practicing agriculture, inter- and intra-group competition for [increasingly scarce subsistence] . . . resources is seen as leading to the evolution of more competitively successful cooperative units in descent (in classless societies) and in political structure, and to the evolution of class stratification" (67)Harner, Michael J. - Population pressure and the social evolution of agriculturalists, 1970 - 4 Variables

    This study tests the relationship between population pressure and social evolution in agricultural societies. The author predicts that population pressure will be positively related to the evolution of descent, political integration, and class stratification. Results support this prediction.

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