Copper futures inched lower Monday as debt problems in Europe and the U.S. continue to cloud the economic outlook.
Copper is widely considered a bellwether for economic growth. The metal is used in everything from iPhones to office-building construction and its price is sensitive to shifts in demand.
The most actively traded contract, for September delivery, was recently down $0.215, or 0.5%, at $4.3915 a pound on the COMEX division of the New York Mercantile Exchange.
Thinly traded July-delivery copper was down $0.25, or 0.6%, at $4.3800 a pound.
The cost of default insurance for Italian, Spanish, Irish, Portuguese and Greek government bonds has shot higher ahead of an emergency summit of euro-zone leaders set for Thursday. The euro-zone leaders are due to discuss a new Greek bailout agreement.
Investors are skittish about putting their wealth into assets like copper, which is sensitive to economic growth, amid an uncertain outlook for a major consumption hub like Europe.
Meanwhile, the U.S. is no closer to a deal to raise the nation's $14.3 trillion borrowing limit. The White House and Republican Party leaders must reach an accord by Aug. 2 or risk missing payments on some of the debt.
"While extremely unlikely, [the prospect of a default] has nevertheless added another layer of confusion to an already uncertain and nervous market," Leon Westgate, base metals analyst at Standard Bank, wrote in a note to clients.
A stronger dollar, which rallied versus the euro, is also keeping copper futures subdued. The euro was recently at $1.4077, down from $1.4150 late Friday in New York.
Copper futures are denominated in dollars and appear more expensive to traders using foreign currencies when the greenback rallies.