Second, the transaction cost of using a foreign currency as a medium of exchange is inversely proportional to the extent to which that currency is used globally. Similar economies of scale characterize foreign investors’ use of a particular international financial center.
其次，使用外国货币作为交易媒介的交易成本与这种货币的全球使用程度成反比。外国投资者使用某一特定国际金融中心具有类似的规模经济特征。因此，IVC和1-IFC的数量不会超过三四个。