A Strong Test of the von Liebig Hypothesis
用非参数方法估计直角等产量线生产函数，并设计新检验来验证冯·李比希假说，最后用玉米和小麦的实验数据进行了测试。
Abstract An implication of the von Liebig hypothesis is that crop‐production functions have right‐angle isoquants. This article presents a nonparametric estimation of right‐angle isoquant production functions. It then describes a new test for right‐angle isoquants. The procedures are used to test experimental data on corn and wheat.