The money is used to buy or sell goods, to measure the value and to accumulate wealth. Most of today's society has a monetary economy based on coins and banknotes in the form or the other form. However, before this was not always so. In the social era, people used barter system directly. Such a person can exchange a sheep to take anything they considered equivalent value. However the trade of this commodity is a system is not satisfactory because the exact needs of people rarely coincided with each other. Everyone needs a more practical Exchange system, and a different monetary system was developed based on the goods that people in society considered valuable. Cattle, grain, teeth, shells, feathers, cranial bones, salt, ivory, tobacco has been used. The precious metal is gradually being used because when was cast into money, or they carry, durable, easy to get and can be divided into the smaller or larger values.
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