Are small farms really more productive than large farms?
指出，在小型农业中，使用单产衡量农场规模与生产率的关系可能产生误导，因为单产还受市场扭曲和规模报酬递减影响。基于乌干达等国的微观数据，研究发现生产率在相同规模农场间差异极大，使农场规模不适合作为政策目标指标。
This paper shows that using yields may not be informative of the relationship between farm size and productivity in the context of small-scale farming. This occurs because, in addition to productivity, yields pick up size-dependent market distortions and decreasing returns to scale. As a result, a positive relationship between farm productivity and land size may turn negative when using yields. We illustrate the empirical relevance of this issue with microdata from Uganda and show similar findings for Peru, Tanzania, and Bangladesh. In addition, we show that the dispersion in both measures of productivity across farms of similar size is so large that it renders farm size an ineffective indicator for policy targeting. Our findings stress the need to revisit the empirical evidence on the farm size-productivity relationship and its policy implications.