By using data from 418 peasants participating in farming -supermarket docking in 6 cities located in Zhejiang and Hebei provinces, this research tried to calculate the degree of information asymmetry and the difference in bargaining power between the peasants and the traders with the method of two-tier stochastic frontier model. The results suggested that: (1)the degree of information asymmetry and the difference in bargaining power between peasants and traders had a significant impact on the determination to the final profit; (2)the relation between the peasants爷ages and the final income showed an inverted “U”curve; (3)heterogeneity of the peasants did have effect on peasants'bargaining power and the net surplus. Based on these results, this research put forward some suggestions to reduce the gap in bargaining power. |