Prices, Technology, and Farm Size
构建并实证检验了一个农业企业理论，解释美国农场规模的长期增长，发现1930-70年间机器劳动比和农场规模的增长几乎完全由相对要素价格变化驱动，而非技术进步或规模经济。
In this paper we construct and empirically test a theory of the agricultural firm which explains the long-term growth in farm size in the United States. Typically the U.S. farm unit is a family enterprise. Consequently the ratio of the opportunity cost of farm labor to the price of machinery services determines the size of the farm operation by influencing the machine-labor ratio. Applying the model to U.S. data, we explain virtually all of the growth in the machine-labor ratio and in farm size over the 1930-70 period by changes in relative factor prices without reference to "technological change" or "economies of scale."