If country A wants things from country B, country A has pay for it in country B's currency. Of course, only few countries can say I only pay US$ or Euros, take it or leave it. Money supply must be backup by size of economy and not the other way around.
Which may lead to this... hyper inflation.
Which may lead to this... hyper inflation.
So, it does not fit into our perception that human has to be behind the cart.
