The act of using one currency in the world mean's that every country in the world uses the same currency.
The use of a global currency will be the starting point of eliminating suffering in the world.
All nations would certainly benefit since there would no longer be currency risk in international trade. Traders would no longer fear for currency fluctuations.
Currency is not the problem of the world and if the whole country in the world starts making use of the same currency it won't change anything because inflation, poverty will still exist. In countries where pounds and dollars are currency you can still see some people that are poor and homeless. The high currency you see day people worked for it to be better and the countries with high currency the reason why the currency is valuable compare to other currency is because of good leadership and good financial management.
Countries that are struggling with hardship and high inflation rate even if they adopt dollar or pound as currency if they lack good leadership on how to improve economy and inability to manage resources the dollar or pound as currency won't have any effect.
Therefore, it is not about currency that will change the condition of people or bring good benefits. The only thing that can bring good financial benefit is good leadership. A leadership that can improve the economy of country, a leadership that can manage the resources that a country has irrespective of the currency. Currency is not the reason why some countries have better economy, the reason for good economy and good benefits is good leadership. Having men that are ready to work to make the currency valuable.
No currency on it just develop good value, people worked for it by doing the right things that is why we have good currency you see today. Countries that are having financial problems, difficult economy, if they adopt bitcoin as currency and they lack the knowledge of how to make economy better their won't be any improvement having bitcoin as currency.