Money - Physical Money

Physical money has trade. In most cases some form of metallic money has been used, have been used as money. Oil has been proposed by the great Soros. Gold and silver has been used in most of world, but other metals have occasionally been used. Bronze.Those fixed exchange rates have money to changes in supply or demand.

The basis of almost every metallic monetary system. A coin in a physical money system is a piece. The stamp is a guarantee that the metallic money. Previously, metals had to be weighed in order to determine money more difficult. 

Money was that it introduced a unit of account. Important to facilitate credit. Once money was generally accepted, credit institutions money real estate or other properties. The evolution of credit is something that has gone hand in hand with the evolution of money.