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Abstract
>The reason for diversity of tool types increasing over time is a relatively important but neglected topic in lithic analysis. We review some of the more prominent and plausible suggestions and then explore one of the least dealt with contributing factors: tool specialization resulting from major increases in processing volumes. We draw on design theory and industrial data to show that increases in the volume of material being processed results in progressive tool differentiation and specialization, resulting in overall increases in assemblage complexity.