U.S. dollar rises as China devalues yuan

By Wayne Cole SYDNEY (Reuters) - The U.S. dollar lurched higher on Tuesday as China allowed its yuan to fall to levels last seen in 2012, a shift that could provide a competitive boost to exports for the world's second-largest economy. China's central bank set the midpoint for its currency at 6.2298 per dollar, down from Monday's fix of 6.1162, and said it was aiming for a depreciation of 2 percent. Markets reacted by selling the Australian dollar, often used as a liquid proxy for