An exchange means the transfer of one char to another or with money. The ancient Dizaman exchange of goods with other goods is called barter. This kind of economy has lasted long ago as money has not been discovered. At that time every item can be exchanged with other goods.
In terms of exchange objects can be identified three types of exchange are:

Real asset exchange (Ayn) with real asset (Ayn)
Real assets account (Ayn) with financial assets (Dayn)
Financial asset exchange (Dayn) with financial assets (Dayn)
Exchange Times.
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