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英文文献：The Effect Of Soil Conservation On Technical Efficiency: Evidence From Central America-土壤保护对技术效率的影响:来自中美洲的证据
英文文献作者：Solis, Daniel,Bravo-Ureta, Boris E.,Quiroga, Ricardo E.
英文文献摘要：
This study evaluates technical efficiency (TE) levels for rural households under high and low levels of investments in soil conservation in El Salvador and Honduras. To correct for potential self-selectivity bias a household-level switching regression framework is implemented to estimate separate stochastic production frontiers for the two groups of households under analysis. The main results indicate that a systematic difference exists between the two studied groups. Specifically, households with higher levels of investments in soil conservation show higher average TE than those with a lower level of investments. Constrains in the rural land and credit markets appear to be the reason behind these differences. Our estimations indicate that for farms with lower levels of investments in soil conservation access to credit is a significant factor explaining the sources of inefficiency. Conversely, households with higher levels of investments in soil conservation present the highest partial output elasticity for land, the highest levels of TE and the smallest farms. This result could suggest the presence of a market failure in the land market which is denying access to land to the more efficient producers.
本研究评估了萨尔瓦多和洪都拉斯在土壤保护高水平和低水平投资下农村家庭的技术效率水平。为了纠正潜在的自我选择偏差，我们采用家庭水平转换回归框架来估计两组被分析家庭的单独随机生产前沿。主要结果表明，两组研究对象之间存在系统性差异。具体而言，土壤保护投资水平较高的家庭比投资水平较低的家庭表现出更高的平均TE。农村土地和信贷市场的限制似乎是这些差异背后的原因。我们的估计表明，对于土壤保持投资水平较低的农场来说，获得信贷是导致效率低下的一个重要因素。相反，在土壤保护方面投资水平较高的家庭，其土地部分产出弹性最高，TE水平最高，农场面积最小。这一结果可能表明，土地市场存在市场失灵，使效率更高的生产者无法获得土地。
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