A Study of Productivity Changes on Individual Crops
提出一种在缺乏部分投入、成本和利润数据时估算单个作物全要素生产率变化的方法，并开发了绝对生产率变化指标，用于比较不同作物间的生产率变化。
This paper is an original attempt to find ways to estimate total factor productivity change on individual crops especially when certain input quantities and cost and profit data are unavailable. The study also develops a method, which is a measure of change in absolute productivity, to allow comparison of productivity changes among crops. Though many agricultural economists agree that technological change is one of the most important factors affecting crop production, few of them have estimated the magnitude of.the effect of technological changes on individual crops. Most studies focus on the estimate of the effect of technological chan·ge for agriculture as a whole or on the effect of technological change on total crop production. Table 1 shows that technological changes occur on different crops in different ways. For example, the production growth rate of soybeans over the last two decades was 5.8 percent while cotton was-0.3 percent. While