When you use your card they ask if you want cash back?

There is only 2 Trillion in circulation, cash is a debt note and contract signed by the US Gov. for payment of debt.

The US tax revenues are 3 - 4 trillion and GDP around 14 Trillion.

An EMP or Cyber Attack will wipe out all digital money the problem is gone if the books are wiped clean and only real assets are left.

One's and Zero's in computers don't really exist they are virtual reality with no contract.

What are you going to back your economy with something like Bit-coin that is unstable as hell or paper money backed by gold.