Because with a million dollars, either cash or digital, I get the ability to recive capital at the dollar withdrawal from the market, which is at loans repayments/liquidations
You're gravely mistaken if you think that this is an exclusive feature of the dollar. It can happen to every currency. You still don't answer to my question, though. You said that you can multiply your dollars, but this doesn't answer on why you would trade your car with some piece of paper.