West and Central Africa do have their own common currencies. The problem is is that it's all a creation of France. But can Africa (or at least most of it) create a good currency union without having to rely on an outside power? How well would it go?
Hasn't African Union some plans with this? But I doubt that this will be very workable currency. Many countries are pretty poor and corrupt and there is too much backwar areas. This might be even worse than Euro.