The present research on sells about the direct selling and the multi-level marketing is very rare, and is lack of the real diagnosis research and the typical case.
已有的关于直销和传销的研究以社会学为视角的很少见，且缺少实证研究和典型案例。
The illegal multi-level marketing network is the variation of direct selling network, it is the extreme performance of social network benefit.
非法传销网是直销网的变异，是社会网络利益化的极端表现。
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