I think that we are already in the money exchange mechanism. I heard that the initial type of money is the gold since the industrial revolution.=I heard that the initial money was gold until the industrial revolution. Long time ago it is common for trade as exchange each products. The bad thng for that trade is every trade must not be fair. So people would like to have the method for trade. That's how the gold was used as a money. It is easy to be counted each products' values. After market was grown, the lack of gold was suffered. That's why the paepr money or coin is devleoped.
We are now in the internet rea, so the electrical money exchange occurs more than real money exchange. In my opinion, the electrical money such as bitcoin will be an alternatives.