Denning says that because of the enormous repercusions on Iran's economy of a war in the Persian Gulf, a more likely scenario is not the cutoff of supplies of Iranian oil altogether but a smaller list of buyers for Iranian oil, making Iran sell the oil at a discount. Saudi Arabia's and Libya's added production would bring more oil to the market. The impact will be larger on Europe because of the decline in the value of the euro, with Brent crude on a 12 month average basis costing 14% more now than in the peak price in 2008. By comparison in dollar terms the comparable figure is 4% higher for the U.S. At a price of Brent crude of $120 in 2012, according to Citigroup, energy costs would take up 9% of world GDP, putting pressure on a economic recovery in Europe and the U.S.