Broad spectrum revolution

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The Broad Spectrum Revolution (BSR) hypothesis, proposed by Kent Flannery in 1969 in "The Domestication and Exploitation of Plants and Animals", suggested that the emergence of the Neolithic in western Asia was prefaced by increases in dietary breadth in Mesolithic and Epipaleolithic foraging societies just before this period.

The changing environments of the time led to diversification of diet. This led to population growth, which brought sedentism and regionalism. This in turn brought more exchange of exotic items (such as copper and/or shells). These items led to the beginning of social differences.