Because the currency is one of the three has a duty as a medium of Exchange, which can cause difficulties and costs in Exchange for a much reduced. If there is no currency. We must redeem one cow directly with the next hundred chickens. The second is the unit of measure in accounting. If there is no currency that we measure the interaction with difficult car car che da yo Super cars are worth more? The third is a rechargeable stored value. If the money does not serve this. We would not be able to make long-distance or cross-trade. All three of these from the page itself. Many different types of metal is used to make money because it's portable. Reliable, durable and not too hard to find (imagine why don't we remove the diamond to make money). The earliest coins are honorably, we have the evidence, therefore, is made from a mixture of gold and silver ore. The age of civilization, which is 600 years ago. Brahms (Lydian coin) currently in the country, Turkey. And a master in the development of the civilization of Greece-Roman coins, as in the later era. The first era of Chinese coins section, made of bronze, about 200 years before Christ, the first of the world's currencies, currency is the silver medal of the Kingdom of Spain (Spanish piece of eight ' a ') from about the 15th century, etc.
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