Third, there was a debate about the impact of land rental market on the land fragmentation and land distribution, but there is still no empirical evidence from china.

第三，农地使用权市场对耕地配置效率的影响仍然存在很多争论，但是基于中国的经验研究十分匮乏。

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This paper summarizes these researches from methodology, empirical evidence and the suitability of productivity effect of outsourcing in China, and gives some brief comments.

文章从研究方法、经验证据和外包的生产率效应在中国的适应性三个方面对这一领域的实证研究文献进行了系统梳理，并做简要评论。

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