"The six nations of the GCC, which also includes Qatar and Oman, earned $381 billion from their exports of oil in 2007 and another $26 billion from gas, according to the Institute of International Finance (IIF). If the oil price remains at about $100 a barrel, they will reap a cumulative windfall of almost $9 trillion by 2020, reckons the McKinsey Global Institute: a vast number relative to the size of the GCC economies, which had a combined GDP of $800 billion in 2007."