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A series of old Indian Head pennies made into a brass belt buckle. |
Historically there has always been some form of "coin" in use, from glass beads, to gold pieces, to minted money there has always been a way to exchange or barter for what we wanted. Bartering didn't use to involve the exchange of money or coin, but often goods for good, or work for goods so a medical man might offer herbs or tinctures to a patient in return for food or work.
For all anyone knows, there may come a time in our future where bartering for food or goods is the only way to acquire things we can't make, or grow ourselves. Nobody really knows what the future holds for humanity.