Study On The Inventory Models Of Purchase Price Rising And Delaying In Payment

Inventory management is the important part in enterprise's management which is the key to make the optimal operating activities. With the technological process and the rapid development of economic, Buyer-oriented has become the main part in market. Therefore, enterprise must realize low cost operation based on the satisfaction of customers, how to reach satisfactory user's service level under the reasonable stock cost has become one of important questions in modern enterprise management.The thesis illuminates the basic theory of inventory management, and time-varying price, backlogging, delay in payment are presented, Based on the analysis of these papers some conclusions are finished.An EOQ model of purchase price uniform rising and partial backlogging which is hinging on waiting time and shortage period. An actual numerical example of Chongqing Carrefour supermarket is presented to illustrate the model. The main parameters are made sensitivity analysis. The results show that the initial purchase price for the dealers have greater effect on optimal ordering number and the total costs of inventory than that of others, So the two factors should be considered for dealers to make optimal ordering strategy. The EOQ model is further extended by considering deterioration and backlogging rate is constant, the corresponding model is presented. The actual numerical example and sensitivity analysis show that backlogging rate have greater effect on inventory control strategy than that of others, deterioration rate has some impact on the inventory system, but it is less than other parameters.Considering the particular of payment and varying sale price, An EOQ model is developed under paying for in time and delaying in payment. The optimal payment time for retailers is decided by the optimal solution. Numerical example and sensitivity analysis are made for the model. The sensitivity analysis shows permissible delay periods and time-value of cost have greater effect on inventory strategy than that of others. The model is further developed by considering varying sales price, the existence of optimal solution is discussed by theory analysis. Numerical example and sensitivity analysis are also made for the model. The theoretical evidences are provided for retailer to make optimal inventory control strategy.