iPath Dow Jones-UBS Copper Total Return Subindex ETN (NYSEArca: JJC) was down over 1% in morning trade Wednesday.
Goldman strategists made waves earlier this week when they recommended pulling out of a commodities trade suggested in December 2010.
On Tuesday, Goldman analysts said the oil market is due for a "substantial pullback," which contributed to the weakness in crude ETFs.
Now, the influential Wall Street firm has downgraded its outlook for copper, according to reports.
"We now believe that prices will likely remain rangebound in 2011 and that risk has become more symmetric given our view that inventories are unlikely to draw down to critically low levels before 2012," Goldman said, Barron's reported.
Investors pay close attention to copper prices because they are seen as an indicator for the health of the global economy.
ETFs tracking copper futures and copper miners have traded in a range so far this year. [see What Next for Copper ETFs?
First Trust ISE Global Copper
