关键词: 私人货币, 法币, 电子货币, 网络外部性

Abstract: As a typical network product,the money evaluates with the feature of standardization and unification.However,the demand for exchange media and payment instrument is not homogeneous,and issuing the private money can bring the supplier the revenue,so there is still the existing space for the private money in the market.The rapid development of electronic private money is the outcome of financial innovation leaded by IT progress,and is beneficial to exchange efficiency,but it will not threat the monopolistic position of the fiat money.

Key words: private money, fiat money, electronic money, network externalities