科技的發展使得產品推陳出新的速度越來越快，消費者的購物模式也受到影響，顧客可能為跟隨流行趨勢快速汰換產品，使得許多產品在到達使用壽命前就被丟棄，而產品生產的過程已經造成環境汙染，若沒有經過妥善地回收處理，又馬上大量製造新品，甚至會對環境造成巨大的負擔，且廢棄產品中存有剩餘價值的零件也無法重複利用，因此意識到環境破壞與原物料日益稀少，各國政府與企業開始重視產品的回收與再製造所帶來的環境與經濟利益。
本研究探討具雙回收通路競爭之閉環式供應鏈最佳回收與定價、回收策略，藉由建構一閉環式供應鏈，其成員包含製造商、零售商與第三方廠商，製造商販售產品零售商，並加入環境投資探討市場需求，再透過零售商與第三方廠商回收其廢棄產品，因此本研究將站在製造商的角度，製造商販售產品同時也考量其 環境投資 並與零售商及第三方廠商合作回收產品，並探討零售商與第三方廠商之間的回收競爭 行為 ，透過賽局模式求得製造商的產品定價 與回收策略 以最大化其利潤 ，並 加入合約 機制 比較 在何種情況 下供應鏈成員 能得 到最大效益。 結果顯示加入合約模型可以達到最高的回收數量提高環境效益 與利潤 對零售商而言可以致力於 降低 其回收成本與 提高 服務程度以降低顧客偏好獲得更高利潤，對第三方廠商而言若顧客對第三方偏好夠高，維持目前回收服務水準即可，因持續改善對回收數量與利潤之影響不明顯，而製造商則可以藉由比較兩回收商之回收成本 高低 來 因應顧客偏好之改變並決定 其價格決策 。

The rapid development of science and changes in fashion trends enable firms to quickly introduce new products to the market, causing many products to be discarded before they reach the end of their useful life. An inappropriate product recycle process may result in secondary contamination, and used parts with residual values may not be reused. Therefore, governments and firms have begun to pay attention to the environmental and economic benefits brought by the recycling and remanufacturing of products due to environmental awareness and the scarcity of raw materials. This study investigates the pricing and recycling strategies with consideration of the recyclers’ competition behaviors and customer preferences, and considers a manufacturer, who sells products to the retailer and outsources the remanufacturing activities to the retailer and the third party. The manufacturer's product pricing and recycling strategies are obtained through the game model with the aims of maximizing its profits, and a contract mechanism is added to coordinate supply chain members, so that all three parties can obtain maximum benefits. The results show that the contract model can achieve the highest recycling quantity and increase environmental benefits and profits. For retailers, they can devote themselves to decreasing their recycling costs and enhancing the service levels to reduce customer preferences and obtain higher profits. For the third party, if customer preferences are high enough, then continuous improvement on service level will not have a significant impact on the recycling volume and profit. Manufacturers can respond to changes in customer preferences and make price decisions by comparing the recycling costs of the two recyclers.

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