Returns to scale in agriculture: An empirical investigation of Japanese experience
使用射线位似生产函数，研究1878-1940年日本农业的规模报酬，发现该时期农业处于规模报酬递增状态。
In this paper a ray-homothetic production function is used to determine returns to scale for Japanese agriculture for the period 1878 to 1940. The advantage of the ray-homothetic function is that it allows returns to scale to vary with both output and factor intensity. The results show that for this period Japanese agriculture operated under conditions of increasing returns to scale.