there is a chance that the economy will improve and there is always something bad will happen also, so the question here is what if we use only one currency if we used it the economy can improve because almost all of the people will cooperate regarding to this currency they will always discuss about it and the bad thing is people will fight against to it.
I think we are already using bitcoin as one currency thorough out the world, I am sure that it will bring too much positive effects on the economy of the countries. as currently very little number of people are using bitcoin but the majority of people do not know about bitcoin, they still need proper introduction and knowledge about bitcoin, so that they can also start earning from bitcoin.