現代科技的進步和消費者價值觀的改變，帶動共享經濟迅速發展，而探討共享經濟的文獻當中，有共享平台之個案研究、共享經濟對各項產業之正負向影響、共享經濟發展之可行性，及政府的相關政策，很少有文章是透過數學模型，分析供給者、消費者和平台業者三方的效用及利潤。本文以Horton and Zeck（2016）考慮供需雙方之共享模型作為基礎，並加入平台業者進行討論，所得出的結論大致可以歸納如下：一、平台業者收取的交易費與平台媒合供需雙方的媒合成本有關；而平台業者收取的會費則是與共享經濟財供需雙方的評價、人數、搜尋成本，以及媒合成本有關。二、當平台業者同時對供需雙方收取交易費和會費時，收取交易費越多，收取會費就越少，反之亦然，兩者呈現抵換關係。三、考慮貼現因子，當平台業者對時間偏好越高，一開始收取的會費越多，未來收取的交易費就越少。以上幾點分析，透過數學模型找出平台業者應向交易雙方收取媒合費用之範圍，使三方達成最有利的交易狀態。

Nowadays, the sharing economy is rapidly growing by the development of technology and the change in customer behavior. In most of research of sharing economy, the main concern is focused on the shared platforms, the impact of the sharing economy on industries, and the policies of the government. Few studies have been carried out concerning mathematical modelling aspects in relation to the utility of consumers, providers and platform operators. This paper is based on the model of Horton and Zeck（2016）, and includes the platform operators into consideration. The conclusions can be summarized as follows: First, the transaction fees charged by the platform operator are related to the service fee. The admission fees charged by the platform operator are related to the evaluation, the service fee, the number of people and the cost of searching of providers and consumers. Second, When the platform operator charges transaction fees and admission fees from both providers and consumers at the same time, the more transaction fees are charged, the less admission fees will be charged, and vice versa. Third, after considering the discount factor, when the platform operator has a higher time preference, the more admission fees charged at the beginning, lower transaction fees will be charged in the future. From the above analysis, we can find out the fees, which are the platform operators charges on users, so that beneficial to tripartite.

陳右怡（2017）。萬物互聯共享，驅動四大新經濟。檢自https://www.itri.org.tw/chi/Content/NewsLetter/Contents.aspx?SiteID=1&MmmID=5000&MSid=744302456762403413（Aug. 18, 2019）
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