Kannapha AmaruchkulJariya Seksan2024-04-182024-04-182019b211053https://repository.nida.ac.th/handle/662723737/6824Thesis (Ph.D. (Applied Statistics))--National Institute of Development Administration, 2019In this dissertation, we analyzed the closed-loop supply chain with buyback contract. We considered the model with one manufacturer and one retailer. First, we derived the optimal order quantity, the optimal contract parameter and consider the condition that buyback contract can coordinate supply chain. Next, we extended the first part by considering for the return policy. We considered when customers return follows the customer’s willingness to return function which depends on return price. We derived the optimal return price and the optimal order quantity follows that price. We found that the optimal return price depends on the buyback price offered by the manufacturer. Then, we considered when the retailer engages in secondary market. The retailer sells the returned product at discount price of the new product in the secondary market. We derived for the optimal resale unit and secondary product price. We found that the retailer can gain more profit when selling returned product in secondary market. In addition, we found that buyback contract can coordinate closedloop supply chain. Using numerical results, some of the relationships between parameters and the expected profits were shown. The results showed that when the wholesale price increases, the order quantity and retailer’s expected profit decrease, but the manufacturer’s expected profit increases. Besides, when the buyback price increases, the order quantity and the retailer’s expected profit increase, but manufacturer’s expected profit decreases. The results also show that the return price 𝑟 and the buyback contract parameters (𝑤, 𝑏) affect the performances of closed-loop supply chain and both manufacturer and retailer receive more profit when the retailer sets the optimal return price. Finally, we present the special topic of using buyback contract in closed-loop supply chain to achieve sustainability: case of electrical and electronic equipment (EEE) and show that supply chain sustainability can be achieved through a buyback contract.117 leavesapplication/pdfengThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.Supply chainSupply chain managementtext::thesis::doctoral thesis10.14457/NIDA.the.2019.160