Damage Control and Increasing Returns
分析损害控制投入的间接作用，指出即使控制与损害函数为凹函数，损害控制投入仍可能产生递增收益，这对害虫防治等实证研究中函数形式的选择有启示，并可能影响通过税收减少农药使用的政策。
Abstract The indirect action of damage control inputs means the marginal productivity of these inputs depends on their effectiveness in controlling the level and size of production loss caused by the damage agent. Increasing returns to damage control inputs can occur even when control and damage functions are concave. The result implies more attention needs to be paid to the functional form selection for damage and control functions in empirical work on pest control and other types of damage control inputs. In addition, the possibility of increasing returns may undermine the general use of taxes to reduce pesticide use.