Quality Certi?cation of Network Externality

[[abstract]]市場中往往因為買賣雙方資訊不對稱的關係,賣方本身擁有其產品的資訊,但消費者卻是必須親身消費、體驗才能了解其品質的經驗財,因此有著不確定性,民宿產業就是這樣的例子,此時業者如果能夠取得第三方的品質認證,不僅提高品質也發了訊號給消費者, 告訴消費者:我是高品質的業者,但第三方認證是否有足夠的公信力取信消費者是個問題,消費者透過觀察該認證的規模,可以協助判斷,規模愈大,信任度愈高,於是本文探討認證推出時,加入認證家數多寡造成的網絡外部性,將會影響認證的發展與推廣,也直接影響了市場中提供高品質產品業者的多寡。[[abstract]]The quality of Bed and Breakfast, named ”experience goods”, is only learned by the consumers after usage. To get the quality certi?cation not only improve the quality of B&B products but also reveal the information of quality to consumers. However, it is common for consumers to believe that the more ?rms joined in the quality certi?cation, the more reliable is the information provided by it. Moreover, larger scale of quality certi?cation might attract more ?rms to join it. This might form a network-externality like structure. This thesis investigates the equilibrium number of ?rm join the quality certi?cation and its impact on social welfare.[[note]]碩