Is There a Farm Size–Productivity Relationship in African Agriculture? Evidence from Rwanda
利用卢旺达地块级数据，研究发现农场规模与每公顷作物产出呈强负相关，且规模报酬不变；若家庭劳动力按市场工资计价，该负相关消失，表明劳动市场不完善是关键原因。
Whether the negative relationship between farm size and crop productivity that is confirmed in a large global literature holds in Africa is of considerable policy relevance. Plot-level data from Rwanda point toward constant returns to scale and a strong negative relationship between farm size and crop output per hectare that is robust across specifications and emerges also if profits with family labor valued at shadow wages are used but disappears if family labor is valued at market rates. In Rwanda, labor market imperfections, rather than other unobserved factors, seem to be a key reason for the inverse farm-size productivity relationship. <i></i>