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Internet has significantly reduced the costs of information dissemination and acquisition and influenced the information asymmetry. In this paper, we use the method of contrastive analysis to explore the four produce markets. Through the analysis and compare of the four markets, we draw two conclusions. The first one is that the asymmetry information decreased and the consumers got lower prices in short term B to C market. The other is that the asymmetry information disappeared and the market changed into a competitive market in the long run B to C market. Accordingly we give the making price policies. Much attention was given to free charge.