remember the purpose of money is not to store wealth,the purpose of money is to facilitate trade and commerce activities,the more trade and commerce a country has the richer it is.if the flow of money were to cease,trade and economic activity within a country will cease and the country will collapse overnight.....this can happen when u let another country control ur money supply,like Greece.during a depression or economic downturn,it is essential that the country has the ability to issue its own currency,this is to prevent a liquidity crunch and simulate more trade and business.....once the economy recovers and strengthens,it is imperative that governments starts taxing more and raising interests in order to remove the excess liquidity from the economy.