Sources of agricultural productivity growth and stagnation in sub‐Saharan Africa
研究了撒哈拉以南非洲农业增长的来源，发现传统投入（土地、劳动力、牲畜）仍是产出增长的主要驱动力，现代投入作用次之，而农业出口和热量供应对生产力有积极影响。
Abstract This paper examines sources of agricultural growth in sub‐Saharan Africa. Growth in the stock of traditional inputs (land, labor, livestock) remains the dominant source of output growth. Growth in modern input use was of secondary importance, but still accounted for a 0.2‐0.4% annual growth rate in three of four sub‐regions. Econometric results support earlier studies that suggest that land abundance may be a constraint on land productivity growth. Growth in agricultural exports and historic caloric availability had positive impacts on productivity. These latter results suggest that positive feedback effects exist between export performance and food security on one hand and agricultural productivity on the other.