The Econometrics of Kinked Budget Constraints
这篇论文介绍了处理弯折（分段线性）预算约束的计量方法，这类约束常见于政府税收转移计划或企业批量定价，并分析了其导致的意外效应和估计困难。
In the last several years, a branch of applied econometrics has developed that is devoted to the development of techniques for the estimation of demand and other functions when the budget constraint is “piecewise-linear,” or “kinky”—that is, when the constraint consists of a number of segments joined together at kink points. Such constraints most frequently arise from government tax and transfer programs. But kinked constraints sometimes arise in nongovernment contexts, a well-known example being the block pricing schedule commonly set by utilities and volume discounting in general. Kinked budget constraints create two difficulties. First, changes in tax and transfer schedules can have unexpected effects that can be exactly the opposite in sign to those expected from economic theory. Examples of this phenomenon are given below. Second, kinked budget constraints make the estimation of demand functions quite difficult.