本文探討對於低經濟價值再生材料(EDRMS) 在低利潤資源回收上，如何制定相關有效 的環境政策。經過深入分析，我們提出一個政策工具，其立論是基於順序競爭賽局的 多層次閉環供應鏈模型，體現互相競爭的製造商、原生和再生材料供應商以及政府之 間的相互作用。分析結果表明，目前的稅收補貼制度是有效的，因為這一政策提高了 參與回收系統各方公司的利潤。我們建議政府應該多關注低利潤資源回收的政策制度。

This paper investigates an effectiveness problem in the enactment of environmental policies aimed at profitless recycling of economically-disadvantaged recycled materials (EDRMs). After thorough analysis, a policy instrument has been proposed. The arguments are established from a closed-loop supply chain model in a multiplayer hierarchical Stackelberg game, manifesting interactions between competing manufacturers, suppliers of virgin and recycled materials, and the government. Analytical results indicate that a tax-subsidy system is effective because this policy improves the profits of all parties involved in the recycling system. We suggest that governments should involve in the recycling practice of profitless materials.