In economic theory, money has three functions: as a Medium of Exchange, a Store of Value and a Unit of Account. These three functions should be attached to the money that we use, but the use of paper money it can not fulfill these three functions at once. Paper money only serves as a tool optimally Medium of Exchange or Exchange. As a Store of Value, its value eroded by inflation over time. Because of rapidly declining in value is the paper money can not consistently used as a Unit of Account. If you have a house that you bought 10 years ago worth USD 400 million; without renovation even now worth over USD 1 billion you really lucky? where's the point? This apparent advantage occurs because the bias unit of account you use.
Money Gold / Silver Dinar or / Dirham actually thousands of years of history can play the three functions of money perfectly. However, due to the regime last 85 years using only paper money - and even last through 27 years of prohibiting the use of IMF gold as a reference currency; the Gold / Dinar and Silver / Dirham we can not enable it as money in the sense Tool Swap or Medium of Exchange optimally.
