With the development of the second-hand market and the popularity of the Internet to produce col-lision,can be divided into C2C mode and C2B2C mode of second-hand network transactions have emerged a series of problems.On the one hand,under this legal relationship,it is necessary to determine the criteria for identifying business practices as well as regulating the margin clause,and also to carry out certain cross-application of commercial law and civil law;on the other hand,a comparison of C2C model and C2B2C model un-der the perspective of game theory can be carried out,and the trigger strategy of repeated game can be con-structed to give some specific suggestions to buyers and platforms.
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