The oldest and most important currency is debt.
Reputation will become an even more important currency in the future.
We are privileged that the dollar is the "currency of last resort" and the most important currency in the world. Global commodities are priced in dollars. Central banks in other countries hold great quantities of dollars. The dollar was the safe harbor, the port in the storm during the credit crisis.
All organisms rely on exchange. They form symbiotic partnerships in order to obtain the energy that they need to survive. Energy is the currency of nature.
It is important to understand that the most important currency is social debt. Doing things for others. In order to get, you have to give.
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