The possibility that some Gulf states, particularly the UAE, might abandon their long-time pegs to the dollar is getting increasing attention (from Martin Feldstein and Brad Setser, for instance).

It makes sense. The combination of high oil prices, rapid growth, a tightly fixed exchange rate, and the big depreciation of the dollar against other currencies (especially the euro, important for Gulf imports) was always going to be a recipe for strong money inflows and inflation in these countries. The economic dynamism -- most striking in Dubai -- is admirable and fascinating, but also now clearly indicative of overheating. Indeed inflation, as predicted, has risen alarmingly. Among other ill effects, it is producing unrest among immigrant workers. An appreciation of the dirham and riyal is the obvious solution.