Regulation regimes subject to the influence of interest groups are compared. It is shown that the allocation of the regulated commodity varies with the implemented control and that the advantage of prices (vs. quotas) increases with the elasticity of the demand for or the supply of the commodity and decreases with the number of organized producers in the regulated industry. Control regimes can be ranked for negative, but not positive, externalities. Finally, a control regime leading to a more efficient commodity allocation also entails using fewer resources in rent-seeking activities.

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."

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."

A mathematical model of applied research is formulated. It views applied research as a search in a given distribution; basic research shifts the distribution searched. The productivity of applied research effort is a function of the gap between technology in practice and basic knowledge. With constant basic and applied research a (stochastic) steady state emerges in which technological change is determined by the rate of progress of basic knowledge, and the technological gap by the level of applied research.

A mathematical model of applied research is formulated. It views applied research as a search in a given distribution; basic research shifts the distribution searched. The productivity of applied research effort is a function of the gap between technology in practice and basic knowledge. With constant basic and applied research a (stochastic) steady state emerges in which technological change is determined by the rate of progress of basic knowledge, and the technological gap by the level of applied research.

A measure of agricultural research output in 75 wheat- and maize-growing countries was utilized to explain increases in yield per unit land in these crops over the period 1948-68. Several alternative specifications were tried, incorporating direct contribution of indigenous research as well as "borrowing" of outside knowledge. Statistical estimates are presented and their economic implications discussed.

Regulation regimes subject to the influence of interest groups are compared. It is shown that the allocation of the regulated commodity varies with the implemented control and that the advantage of prices (vs. quotas) increases with the elasticity of the demand for or the supply of the commodity and decreases with the number of organized producers in the regulated industry. Control regimes can be ranked for negative, but not positive, externalities. Finally, a control regime leading to a more efficient commodity allocation also entails using fewer resources in rent-seeking activities.