John Brash: Diversification has been a deliberate policy of GCC governments for some time. The drop in hydrocarbon revenues actually shows this to have been apt and robust. So while the doom-and-gloomers would have us think the region was forced to diversify, it is actually the opposite: a case of foresight being proven. The result is that the GCC has, in the main, been able to ride out the fall in oil prices with typical panache.