Supply and demand is about much more than just currency. It's the wanting of things but not having them. It's the willingness to negotiate a trade. I don't know anyone that would spend half their life in a rocket just to get to another planet where there might be interesting things there. Our finite time alive is precious. It's scarce and thus valuable. Supply and demand comes into play when we decide how to spend our time. There is a very limited supply and we demand it for spending with family and friends, on learning skills, procreating, and other such desirable activities. Economics is about managing what you have against the pursuit of what you desire but lack.
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