Evolutionary Mechanism of Downstream Duopoly’s Behavior on Supply Chain with Unbalanced Bargaining Power

Taking the supply chain consisting of many monopolistic competitive suppliers and two oligarch competitive retailers as the research object,we investigate how suppliers’bargaining power affect stronger retailer’s buyer power abuse and get the evolutionary stable strategy(ESS) of retailer’s transaction behavior to suppliers through the double groups’evolutionary model of Evolutionary game theory. The results show that suppliers’stronger bargaining power and the higher transaction and risk cost which are induced by the strategy of retailer’s transferring cost to suppliers can help to eliminate retailer’s buyer power abuse.