All money is portable power. A form of value.
You may ask what is the most useful, desired, and rare form of value. It is knowledge. It is the only way to become a source of creation through your mind at a will of an instant, and market it like a commodity and use it a resource for others to learn more knowledge off of. It is the only true power, because it is the only true form of value there is.
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From @sedik