Dec 21 (Bloomberg) -- Copper advanced for a third day from London to Shanghai on optimism the economic recovery in the U.S. remains on track, boosting the demand outlook for the metal used in construction and household appliances.
The metal for three-month delivery on the London Metal Exchange rose as much as 0.3 percent to $9,230 a metric ton, and traded at $9,218 by 9:06 a.m. Singapore time.
Copper for March-delivery on the Shanghai Futures Exchange gained as much as 1 percent to 69,300 yuan a ton, and futures on the Comex in New York added as much as 0.3 percent to $4.2185 a pound.
