| Abstract: | 全球化時代，市場競爭愈趨激烈，企業要創造利潤並提高附加價值，就需要讓供應鏈體系中的物流、資訊流和金流管理能夠完全整合。信用交易亦稱為「信貸」或「賒購」，是為企業最普遍使用和接受的短期資金來源。供應商經常藉由提供信用交易來提升銷售量，降低存貨；同時，零售商亦可以利用在賒帳期間銷售貨品所得到的收入投資獲利。過去許多研究都證實付款方式會影響零售商的訂購以及庫存。隨著商業環境的改變和信用交易使用的頻繁，至今，已有不少文獻探討有關信用交易的存貨模式。但因信用交易的形式日新月異，許多目前已廣被使用的信用交易條件不是被忽略就是未納入研究考量。
本論文以供應鏈的觀點，運用管理科學的計量方法，透過數學模式的建立，探討在供應商和零售商存貨整合的情況下，三個廣被使用的信用交易條件對供應鏈整體獲利的影響。本論文包含五個章節，第一章首先說明本論文之研究動機與目的、相關文獻探討和論文結構。第二章研究在供應商和零售商同時提供信用交易的情況下，當產品的需求情形會隨零售商所提供賒帳期間的長短變動時，決定使得供應鏈整體獲利最大的最適訂購、運送以及存貨策略。第三章則探討當零售商於特定期間內提早付清貨款就可享受價格折扣的優惠；否則，就必須在最後付款限期內付清全額貨款的情況下，買賣雙方應如何共同定訂最適的零售價格、訂購週期、訂購數量，以及在一個生產週期中供應商運送給零售商的次數，而使得供應鏈整體獲利有最大值。第四章討論當供應商提供的信用交易條件與零售商訂購的數量有關時，買賣雙方應如何共同定訂最適決策，使得供應鏈整體獲利有最大值。最後，第五章對本文各章所建構的存貨模式做一總結，同時提出未來的研究方向。
Under the progression in globalization and fierce market competitions, in order to create benefits and raise additional value, the coordination of three basic flows within the supply chain, material/product flow, information flow, and cash/ finances flow, is necessary to enterprises. Trade credit, also called “buy on credit”, is the most general short-term capital source used by enterprises. The supplier often offers a trade credit to improve sales and reduce stocks on hand. Also, retailer can utilize the selling income during credit period to profit. Many reports have verified that the payment methods offered by the supplier will influence the ordering decision and inventory control. Though many inventory models related to trade credit have been reported so far, with the change of business environment and progression of trade credit policies, many already widely used trade credit terms either been neglected or not considered.
In light of the lack of research dealing with the operational impact of trade credit policies, in this thesis we propose three integrated inventory models under the trade credit conditions. Chapter 1 involves the motivation and objective of this thesis. In this chapter, literature review about relative research papers is also included. Chapter 2 presents a stylized model to determine the optimal strategy for the integrated supplier-retailer inventory model under the condition that both the supplier and retailer have adopted a trade credit strategy. The market demand for the item increases exponentially with the customer’s credit period. By analyzing the total channel profit function, we develop an algorithm to simultaneously determine the retailer’s optimal order quantity and the number of shipments per production run from the supplier to the retailer. In chapter 3, we develop an integrated supplier-buyer inventory model with the assumption that the market demand is sensitive to the retail price and the supplier adopts a trade credit policy. The trade credit policy discussed in this chapter is a “two-part” strategy: cash discount and delayed payment. That is, the supplier offers the buyer a cash discount if payment is made before a specified period, and if the buyer does not pay within the specified period, the full purchasing price must be paid before the delay payment due date. The objective of this chapter is to determine the optimal pricing, ordering, shipping, and payment policy to maximize the joint expected total profit per unit time. In Chapter 4, the effect of an order-size dependent trade credit on the total integrated profit is taken into account. An integrated inventory control model, making joint economic lot sizes of the buyer’s ordering and the supplier’s production batch, are developed to maximize the total expected profit per unit time. Finally, concluding remarks are made in Chapter 5, and future research directions are proposed. |
