Lewis W. answered 06/27/14
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Chelsea: First there was barter system which was very difficult to define relative value. Coins met the needs of both the buyer and the seller for a standard unit of trade. Coin, as opposed to paper, tends to last longer and therefore provides greater value to the producing mint. Coins are harder to replicate due to the striking and the composition of the metal base. Coin has an immediate liquidity. I hope this helps. All the Best. LEW