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Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
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.