sharecropping的问题啊

分成佃农制，维基的解释：
Sharecropping is a system of agriculture or agricultural production where a landowner allows a sharecropper to use the land in return for a share of the crop produced on the land. Sharecropping has a long history, and there are a wide range of different situations and types of agreements that have encompassed the system. Some are governed by tradition, others by law. Legal contract systems such as métayage (French origin) and aparcería (Spanish) occur widely, and Islamic law has a traditional “musaqat” sharecropping agreement for the cultivation of orchards.

美国南北战争之前，南部很多庄园实行的就是分成佃农制，详见：
http://en.wikipedia.org/wiki/Sharecropping

sharecropping
1、分成制
Sharecropping principle-agent model
分成制委托代理模型

2、收成制
With the establishment of the Sharecropping in American South,country stores became an important part of the econom