中文摘要：

从制造商的视角出发，将产品质量水平作为内生变量，并考虑质量水平对返回废旧产品的降级率的影响，分别讨论单寡头、双寡头非合作以及双寡头合作市场中，制造商最优制妙再制造决策策略．根据需求市场对产品价格和质量水平的敏感性，进行经济性分析，权衡制造商的制妙再制造的收益、生产成本，优化产品质量水平，帮助企业决定合理的再制造比例．研究结果显示：随着降级率的增大，制造商会降低再制造比例；制造商设置的降级率在不同模式下对利润与价格的影响是有差异的．

英文摘要：

From the perspective of the manufacturer, considering product quality as an endogenous variable, this paper studies the effect of quality level on the degradation rate of returning waste product and discusses the optimal manufacturing/remanufacturing decisions respectively in the single oligarch, non-cooperative and co- operative duopoly markets. Based on the demand sensitivity for price and quality, we conduct an economic a- nalysis, balance the manufacturingc/remanufacturing revenue and cost, and optimize the product quality level to help companies find a reasonable proportion of remanufacturing. The research result indicates that manufac- turers will lower the proportion of remanufacturing with the increase of the degradation rate, and the degrada- tion rates set by the manufacturer will influence the profit and price differently under three patterns.