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Abstract
Agricultural production continues to shift to larger farms in the U.S. I show that the shift
is persistent over time, large, and ubiquitous across commodities. I review theories of
farm size, and classify three channels for analysis: 1) scale effects, through technological
economies and managerial diseconomies; 2) the roles of relative factor prices and factor
shares; and 3) policy and institutions. Finally, I evaluate the empirical evidence on the
forces driving structural change, distinguishing between crops and livestock because of
important differences in the role of scale economies and coordination, and I offer some
directions for the future.