近年紡織產業中快時尚模式面臨永續議題的壓力，出現利用低汙染與可生物分解的纖維製成的服飾或是回收廢棄物再利用的技術。本研究利用兩期耐久財寡占模型，來捕捉循環經濟下的紡織產業廠商行為與社會福利。假設市場上存在一間傳統的既有廠商，第二期時進入一家生產環保產品的新廠商。我們發現環保產品的進入並不一定能增加社會福利。此外我們比較快時尚市場與擁有耐久性產品的市場後，發現當消費者對產品願付溢價高時，會使得廠商生產產品壽命更低的產品，而使計畫性廢棄的問題更嚴重，當願付溢價足夠高時，會趨於快時尚廠商。也發現快時尚市場的社會福利較有產品耐久性市場的社會福利來的低。

In recent years, the textile industry is under the pressure from sustainability issues, and there are new technologies that make fibers more non-toxic, less polluting and biodegradable, or technologies that recycle waste. This study uses two-period durability oligopoly model to capture the firm’s behavior and social welfare of textile industry under the circular economy. We suppose that a single traditional firm in the initial period and depending on the firm’s chosen product durability, a firm which manufacturing environmentally friendly products joins the market in period two. We find that the entry of environmentally friendly products does not necessarily increase social welfare. In addition, we analyzed the fast fashion market and the market with durable products. We find that when consumers are willing to pay a high premium for products, firm prefer to produces products with lower product life, and the problem of planning waste will be more serious. When the premium is high enough, it will tend to be the firm under fast fashion market. It has also been found that the social welfare of the fast fashion market is lower than the social welfare of the product durability market.

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