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Conclusions and Future Research

In this study, we investigate in recycling systems by constructing a closed-loop supply chain model where retailers engage in the collection work. We describe the current recycling practices in three major IT companies and propose a conceptual model to summarize the current practice model. In the current practice model, the manufacturer authorizes a third-party player to collect used products from customers. However, from the past researches, a recycling model where third-party players engage in collection work is inefficient. Then we develop a retailer collection model where used products are collected by the retailer. In the proposed retailer collection model, the retailer collects those used products and the manufacturer cooperates with third-party players to handle those obsolete products.

From the analytical results of the retailer collection model, in order to maximize the manufacturer’s profits, it would like to see a high return rate of used products. In order to earn higher profits, the manufacturer provides the third-party player with an appropriate contract to induce the retailer to increase the return rate of those obsolete products. Then we compare the performance measures such as the return rates, the profits of manufacturer, and the total profits between the retailer collection model and the current practice model. We verify that these performances of the retailer collection model are better than the current practice model under some conditions. Furthermore, we consider that the third-party player in the retailer collection model acting as a non-profit organization where the unit cost is equal to the unit revenue. When the third-party player is a non-profit organization, the return rate, the profits of manufacturer, and the total profits in the retailer collection model are better than the current practice model.

In this study, we describe the contract relationship between the manufacturer and the third-party player as a simple linear contract with used products return rate. However, some

other contract types such as the revenue sharing contact and the incentive mechanism design which are introduced in Section 2 are proposed to improve some performance measures in supply chain models. We may incorporate the contract design concepts into the recycling models proposed in this study to make the recycling system more efficient. Those returned obsolete products can be collected by retailers or third-party firms. We can also consider the condition where retailers and third-party firms both engage in used products collection work.

Then in the recycling market, there exists a competition relationship between the retailers and the third-party firms. In practice, a manufacturer would face several retailers and third-party players and we may consider multiple retailers and third-party players in future research.

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