本計畫擬建構一個一家中間財廠商、一家正版廠商與多家可自由進出市場的仿冒廠商之 理論模型，藉此模型來討論仿冒的進入對於正版廠商利潤、消費者剩餘與社會福利的影 響。在垂直關係的產業結構下，本計畫希望討論 (1) 仿冒的出現是否必然會對正版廠商 造成傷害與降低正版廠商的研發誘因？ (2) 政府取締仿冒的執法政策如何影響中間財 廠商訂價決策？ (3) 政府取締仿冒是否有利消費者？(4) 政府最適的執法程度與未考 慮中間財市場的既存文獻結論有何差異？ This project establishes a theoretical model, includes one intermediate-good’s firm in the upstream market, one original firm and counterfeiter with free entry in the downstream market, to discuss the influences caused by counterfeiting on profits of original firm, consumer surplus and social welfare. Under the vertical-related market structure, the purpose of this project is (1) to investigate whether the counterfeiting decrease the profits and the incentive of R&D of the original firm? (2) to explore how the government enforcement policy affects the pricing and profits of the upstream firm? (3) to discuss whether the government enforcement policy will benefit consumers? (4) to explore what is the difference between the government enforcement policy in the presence of and that in absence of counterfeiting?