[Edited to make it more understandable question]
What if all nation use only a one currency or one global currency?, What will happen to our world?, What is the effect of every nation's or every country economy?, It can make people's unite each other?Any opinion.
[/quHaving a global currency would, I think, be beneficial to some countries and at the same time would damage others. Buying powers of currencies would be eradicated because we are using only one currency and governments would have no control but a single worldwide agency would.

[Edited to make it more understandable question]
What if all nation use only a one currency or one global currency?, What will happen to our world?, What is the effect of every nation's or every country economy?, It can make people's unite each other?Any opinion.

If all nation is using one currency, I think, this is a big burden to all of us. You know why? Because we cannot dictate of our currency rate is increasing or decreasing. We cannot notice if our economy is going up or down. Having too many currency in the world is very important, it is also the one of the basis if our economy rate is increasing or decreasing. Having too many economy in the world will also helps other people to earn and gain money.

if there is only one currency there would really be a competition on each country to accumulate as much as they can because it would really symbolizes power if a country would really have the most possession of such currency which would really mold up chaos because superiority would really be there.This is why this thing is impossible instead of uniting on most countries it would rather create chaos.

Not only that because if there is only one currency there would really be a competition on each country to accumulate as much as they can because it would really symbolizes power if a country would really have the most possession of such currency which would really mold up chaos because superiority would really be there.This is why this thing is impossible instead of uniting on most countries it would rather create chaos.

It will put a stop to all these pathetics currency wars. It would already be a good point. On the other hand it would present some serious challenges as every part of the world is not on the same level of productivity.

[Edited to make it more understandable question]
What if all nation use only a one currency or one global currency?, What will happen to our world?, What is the effect of every nation's or every country economy?, It can make people's unite each other?Any opinion.

It will be good, it will give more difficulties to any government to influence another country's economy. The economy system will be fair for any countries.

That's right, every nation has created their own currency and the value of the currency in foreign exchange will represent
the global strength of a county. There is no way a government would allow to use one currency because countries are competing.