The pound makes more sense economically. When a country hits recession or a boom, the government change the value of money to help the country fix itself, sorta. Thats why the exchange rates change all the time and don't stay the same. Problem is with the Euro, whereas before each individual country could change their rates, all sorted, now everyone has the same, they all have to change together, and with all the different countries having different economic states, it's a huge problem. For example, say everyone in Europe joined the Euro. Britain would have hugely different economics to Romania for example, and as we would be using the same currency, we can't fix it as before. I haven't studied economics in 2 years, so I'm pretty rusty, but I'm sure thats how it roughly works.