Cities can have purchasing power. Unfortunately it's fiat. So the M2 money supply matches this graph. https://fred.stlouisfed.org/series/M2SL

What is very interesting to me is that there is exactly the same amount of "money" that there always has been. Bitcoin just happens to be the most accessible and ungovernable ledger. It has governance but not government. Maybe a bit of mentle as this device is in the minds of us and other users. For us the balance is the medium.