Once ( if ever) physical demand overcomes supply !e.g. people...

Once ( if ever) physical demand overcomes supply !
e.g. people demand their pay in Silver or gold or private sales ( barter medium ag au) ( like maybe a used car) will be done in Au Ag ! Like in parts of venezuela they pay with gold in supermarkets ! Goods are priced in goldgrams on the shelf !
Once lets say 1 billion people suddenly would think " hey i still have these awkward 17.000 Fiats on this savings account , i think i rush them to a pm dealer tomorrow to convert into shiney before worthless or digitalized " .............

Then !