Copper is flat in early Asian trading. Concerns over U.S. monetary policy is weighing on sentiment, and a stronger U.S. dollar is creating headwinds, keeping investor appetite subdued, ANZ Research writes in a note. Still, copper likely found some support from signs of stronger demand in China, ANZ adds. The three-month LME copper contract is flat at $13,274.00 a ton. (kimberley.kao@wsj.com)