Based On The VMI Supply Chain Coordination Under The Emergency Research

The acceleration of global economic development has led to more and more intense competition between enterprises,and the competition is transformed from competition among individual enterprises to competition among supply chains in which the firm is located.The Vendor Managed Inventory(VMI)came into being.At the same time,due to the rapid development of the world economy,caused the frequency of emergencies is becoming more and more,therefore,under the influence of an emergency,how to solve the VMI supply chain's coordination,has become the focus of many enterprises and scholars.Firstly,it analyzes the coordination problem of supply chain in VMI under the change of market demand.After the study,the VMI supply chain can't be coordinated under the pure VMI,The VMI supply chain can be coordinated after using the residual subsidy contract.In the event of unexpected events caused by changes in market demand,the improved contract can make the emergency response to the supply chain.At the same time,it is shown that the optimal supply and the optimal wholesale price in the supply chain do not need to be changed when the market demand changes within a certain range.When the market demand changes more than a certain range,the optimal supply in the supply chain and the optimal wholesale price needs to be changed accordingly.Secondly,the paper analyzes the impact of market demand and the cost of production on VMI Supply Chain when the market demand function is the product form.It has been proved that the surplus subsidy contract can coordinate the supply chain,and the improved contract can coordinate the supply chain after the emergency.Research shows that when the market demand and production costs change within a small range,the optimal supply does not need to change,but the optimal wholesale price will make some changes.When the market demand and production costs change over a certain range,the optimal supply and the optimal wholesale price needs to be changed.In addition,when the market demand and production cost change at the same time,the optimal wholesale price is affected by the production cost,the optimal supply is affected by the market demand.Finally,it analyzes the coordination of the VMI supply chain under the retailer's efforts,which causes the market demand and the production cost to change at the same time.It is proved that the surplus subsidy contract can't coordinate the supply chain and then the two-way subsidy contract can make the supply chain to be coordinated.The research shows that when the market demand and production costs change in a small range,the optimal supply and the optimal efforts are unchanged.When the market demand and production costs change beyond a certain range,the optimal supply and the optimal degree of effort need to be changed,at the same time,when the market demand and production cost change in a certain region,the optimal effort level of the supply chain will have obvious mutation.