Quadratic Spline Models for Producer's Supply and Demand Functions
提出并估计了生产者产出供给和投入需求函数系统，推广了标准归一化二次形式，通过添加时间变量的线性或二次样条，在保持全局曲率正确的同时，更灵活地处理技术变革。
In this paper, the authors propose and estimate a system of producer output supply and input demand functions that generalizes the standard normalized quadratic form. The generalization adds either linear or quadratic splines in a time (or technical change) variable, yet retains the main attractive property of the normalized quadratic, which is that it can provide a local second order approximation while maintaining the correct curvature globally. However, the generalization has additional desirable approximation properties with respect to the splined variable and, thus, permits a more flexible treatment of technical change than is provided by standard flexible functional forms. Copyright 1992 by Economics Department of the University of Pennsylvania and the Osaka University Institute of Social and Economic Research Association.