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Prices are as old as mankind. They existed long before the invention of money. They were not expressed in units of currency, but rather in exchange ratios among goods, a system we still know today as bartering. As children, my friends and I often played marbles, and we traded them. For a marble with a rare color, one would need to offer several marbles with more common colors. The price of a marble with a rare color was higher than the prices for the more common ones.
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