A single global currency is introduced in all countries.
Advantages:
1. It's comfortable to travel to another countries because you don't waste your time to exchange money.
2. It's easy to loan for investing in other countries.
3. It's easy to export goods that is produced in our country.
4. Exporters and importers don't get a risk from currency fluctuation.
Disadvantages:
1. Each country can't control about the finance by itself.
2. There are a lot of debts in some countries because of convenience to loan.
3. It's hard to adjust value of money when some countries have terrible economies because there are different levels of economy.