Evolutionary game analysis on opportunistic behavior of purchasing alliance with Con t ract mechanism

This paper analyzes the evolutionary process of purchasing alliance members with Contract mechanism. Contract mechanism is divided into complete contract mechanism and incomplete contract mechanism. On the basis of fewer preventive costs and meeting certain relations between cost and income, complete contract mechanism is able to restrain the opportunistic behavior of purchasing alliance members in the following two circumstances: the one is larger compensation coefficient; the other is modest compensation coefficient and good purchasing alliance environment. Incomplete contract mechanism is able to restrain the opportunistic behavior of purchasing alliance members when meeting fewer preventive cost, moderate compensatory coefficient and good purchasing alliance environment.