Abstract: Ameliorating technology sharing and joint purchasing can reduce the operational cost of purchasing coalitions for ameliorating items. However, there are some problems that need to be solved. For example, whether to choose the innovation of ameliorating technology, what the level of improving ameliorating technology is, whether to share the ameliorating technology, how to allocate operational cost that in order to keep the stability of coaliton? In this paper, a joint purchasing co-opetition game model of ameliorating items with ameliorating technology competing and sharing is constructed based on the classical EOQ model. First of all, given the investment of improving ameliorating technology, the operation strategies and total cost of joint purchasing coalitions for ameliorating items with ameliorating technology sharing are obtained. Then, it is pointed out that the core of cooperative game of joint purchasing coalitions for ameliorating items is non-empty using a special allocating rule. Finally, the ameliorating level obtained by using equally allocating rule will lower than the optimal ameliorating level under centralized system. In addition, the lowest cost of system will be obtained by using the pole of core of cooperative game of joint purchasing of ameliorating items with ameliorating technology sharing. The results show that the equally allocating rule will not achieve the optimal cost by joint purchasing coalitions of ameliorating items with ameliorating technology sharing, however the pole of core can achieve the centralized decision-making level.

Key words: ameliorating items, ameliorating technology sharing, joint purchasing, co-opetition game