Copper prices bounded back on Friday to the highest levels in more than five years after a surge in credit growth relieving concerns over the world's top user's economic rise. While shadow lending rose to the highest in monthly records that began in 2012, new yuan loans missed economists' forecasts, raising speculation that China will adopt cash incentives to support economic expansion. China's consuming of copper is estimated to 45 percent of global copper demand, compared with 8 percent for the U.S., according to Morgan Stanley estimates.