Do you think the world should have a single currency?

sure, it is a good idea. but, practically it is so very difficult

nice thinking i think its a good idea buddy......

yes, if it is possible, there would be no problems purchasing worldwide if only if we only have one currency

I doubt whether it is that much easier as said. Since the european countries have a similar economy, it might be possible to introduce euro as a common currency. But for other countries, I do feel that it won't be acceptable. Got to learn economics in detail to have some good views on that....LOL

Yes it is a good idea. I think there are many problems with it because the whole economy will get disturbed because there will be no balance among the countries economy. All the country will become equal with respect to economy.

We have to consider those weaker currencies as well. The rich will get richer, the poor will get poorer.

I do think that would be a great idea so that you don't always have to convert your currency to other country's currency to see how much it is in their currency.