| With the development of Chinese rapid economic, the highlight status is growing among the top ten industries in creation of the gross national product. Electronic information industry is the leading national economic development industry, which play a greater role to promote the development of other industries, especially in science and technology contribute to a higher proportion of share and strong permeability. A high degree of application of electronic products, to some extent, it marked a comprehensive scientific and technological strength and mastery of science and technology high level of practical application in a region. International history of the development of the electronics industry shows that: the electronics industry has always been a performance of high-tech, high- knowledge-intensive and the rate of update is higher than the other industries, It is counted by month for the product which is originally counted by year. In resource-poor areas, especially in coastal areas, it is very suitable for technical personnel to work in the electronics industry and display their talents, Japan, Singapore, South Korea, and China's Taiwan, Hong Kong and Shenzhen all put the electronics industry as the pillar industries, its products export rate is more than 70% every year. it's growth rate is much higher than other industries.However, the continuous advancement of technology shorten the life cycle of many products, the reducing of electronic product life cycle increase in the risk of excess inventory. For example, in Hewlett-Packard, the average desktop inkjet printer cycle is about 18 months, some derived printers will last for few months. In the computer industry, for 6 months is common, and some channels only maintain for several weeks. The inventory cost could be close to 50% of product cost for printer or computer in one year, because the devaluation of products every day, there must be more second-hand or through other channels to discount sale. Moreover, in the computer and peripherals market, manufacturers face continued price competition and narrow profit margin, they need low inventory and high level of service to ensure that investment in product development proceeds. Thus, with advances in technology, market competition, shortened product life cycles, to speed up the replacement, these features enable the evolution of electronic products own the characteristics of perishable goods. Perishable products refers to as a result of the characteristics of the product itself or the target consumer group's preferences, so that these products have a relatively short sales cycle, at the end of unsold products or failure to deal with price cuts, with the strengthening of public awareness of environmental protection, some unsold even need handling costs. Inventory management of perishable goods has become an increasing concern and attention.With these questions, the delay payment mechanism solves the differences on the order quantity between the manufacturers and retailers. Manufacturers use the system of delay in payments to stimulate the retailers to expand of the order volume, and retailers improve the predictability of the market and eventually the whole supply chain is fully coordinated under the extension funds. Therefore, the delay in payment is valuable to manage the short life-cycle products. The delay in payment improves the level of the distribution, reducing inventory product, while reducing costs and sharing the risks of supply chain.This article firstly introduced the development of the electronics industry background, summarized the current research gaps of delay in payments contract, deferred payment contract research results on the basis of analysis of domestic and overseas supply chain, The study focused on result in previous and the direction of the field is divided into two types: one is researching the payment contract model, namely: in the supply chain there is no delay payment mechanism before, through the establishment of the model to design the form of delay payment, Another study is very common, it assumptions that delayed payment mechanisms are already in place, and then research the credit period that seller gives to the buyer or the order quantity, inventory levels, sales prices of buyers. After that the literature based on the EOQ will be divided into the following categories:①to consider the deferred payment of cash discount model;②consider products of the deferred payment model metamorphism;③deferred payment period and order quantity related cases;④EPQ framework based on deferred payment model;⑤circumstances an extension to pay the optimal time to study the payment;⑥price discounts and deferred payment of the comparative study. This article is based on the EOQ model. therefore, in this paper introduced two-level supply chain based on the traditional economic order quantity (EOQ) mode, as well as the deferred payment contract for the EOQ model, and finally to electronic products depreciation rate of accession to the model, analysis of the products of the impact of the depreciation of inventory.All along, the research of two level supply chain has been a hot research scholars, the two level supply chain that is a single supplier and a single retailer. The benefits of two level supply chain research is to show the mode of the trade between supplier and buyer, However, in the two level supply chain contract research, there is a serious shortcoming, according to Porter's Five Forces Analysis model, enterprises are facing the impact of five forces in the market at the same time, Namely: the bargaining power of suppliers, the bargaining power of buyers, the capacity of potential competitors, the capacity of the alternative capacity, the competitor capacity in industry. There is only one factor to affect the two level supply chain either from the supplier point or from the retailers point, and the model is too simple. To this problem, in this paper, supply chain will be extended to three-level from two-level, and research the how the retailer manage between supplier's force and buyer's force. According to the Porter's Five Forces model, this paper would be a step of deeper study, and compliment the shortcoming of three-level supply chain.In this paper, we refer a delay in payments contract based on three-level supply chain with perishable rate and delay rate, through establishing the model analyze and simulating , we get the affection of perishable rate, ordering cost and delay rate. By the numerical example, the rate of increase in perishable products, so that enterprises in the supply chain to reduce the order cycle, gradually, gradually reducing the minimum order quantity, the annual total cost to increase gradually. However, the rate of perishable products is not decided within a single model the trend of the changes in the transfer of the case. With the cost by ordering a small increase, within a single model by matching the situation has changed gradually from T≤N |
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