If you were to have a money supply of bills up to 100, serialized by one letter and eight digits, running only prime numbers, the sum of the whole pile would be just over 28 billion units.
For a country of 300 million people, evenly split, that pile would give every single person a daily allowance just shy of 94 units.
Cash, daily, forever.
The question we face now is: why can't politicians do 3rd-grade math?
Also, banks offer a very valuable service. A place where you can obtain funds for investments among other things. There are many jobs that don't produce, merely provide services. But the society would collapse without them.

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