If the world uses a single currency, will the economy be more stable?
This is a very interesting question. The sovereign nations issue their own currencies and are taken for granted by many people, but few consider whether this is the economically optimal option.
If world is using single than world will be having trade loc same as having European union, whole Europe has single currency Euro.
But right now we can't imagine decentralize currency as world currency.
let's suppose if world have single currency than how countries control inflation rate inside the country.