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中文摘要：
由于研究方法的局限性以及对合作社服务功能的稍欠考虑,现有的关于合作社增收绩效的研究结论有偏差,因此借助内生转换模型（ESRM）来弥补已有研究在方法上的缺陷,并尝试将合作社的服务功能纳入实证分析框架。来自全国15省1 243位农户的数据表明：（1）合作社并不必然提高社员收入,合作社只有在充分发挥其服务功能的情况下其增收效果才显著;（2）在合作社发挥其服务功能,并校正样本选择偏差的前提下,合作社对农户家庭农业收入的平均处理效应为0.706,并且非社员农户在参与合作社的反事实情境下,其收入的提升幅度将超过社员农户;（3）多方法的比较研究显示,内生转换模型是当前评价合作社增收绩效比较严谨的方法。
英文摘要：
Owing to the limitations of research methods and neglecting cooperatives＇ service function, the con- clusions of existing studies on cooperatives＇ performance for income-increasing may not hold truth. This paper uses endogenous switching regression model （ESRM） to make up the shortages of the research methods in previous researches, and attempts to bring cooperatives＇ service function into the analysis framework. The evidence of 1 243 smallholders from 14 provinces in China reveals that ： （1） Cooperatives do not necessarily increase farmers＇ income, and they work only when they play their roles of serving their members. （2） In this premise as well as eliminating sample selection bias, cooperatives＇ average treatment effect is 0. 706. Furthermore, if non-members were cooperatives＇ members, their income would improve at a rate exceeding that of existing members. （3） By compa- ring the results conducted by different methods, such as OLS model, treatment effect model and ESRM, we find that ESRM is a relatively rigorous method for investigating cooperatives＇ performance for income-increasing. The results of this research are of great value for the dcademic researches as well as the practice of the cooperatives.
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