Copper prices rebounded on Friday, paring losses for the week, after the US economy showed signs of recovery, while Europe's debt crisis slowed demand in emerging markets. The most-traded February copper contract on the Shanghai Futures Exchange gained 2.4 percent to 54,300 yuan ($8,500) a tonne. Prices tumbled to a three-week low of 52,820 yuan in the previous session. Futures have lost 24 percent this year.