Should the world have one currency? Ask USA TODAY

Things would probably be so much easier if we had a single currency to use throughout the world (sort of like the Esperanto of money), right? No pesky exchange rates to calculate when traveling from country to country. No need to stop at a bank to pick up the local money when you hit each destination.

After all, explains USA TODAY Money reporter John Waggoner, one can look to the Euro to see all of these advantages at work. Unfortunately, one can also look to the Euro to see all of the disadvantages at work. One of the biggest? Shifts in interest rates.

Some economies, such as Germany's, have recently needed higher interest rates, others such as Greece's struggling economy, have needed lower ones. Why does this present a problem? Take a look at the rest of Waggoner's answer in the video below.

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