The iPath Dow Jones-UBS Copper ETN, which tracks an index of copper futures, has lost momentum in 2011 and is trending lower.

Ross noted copper in late 2008 called the low in stocks four months before it occurred. So when copper “displays the tell tale symptoms of technical erosion you would be wise to listen,” he wrote.

iPath Dow Jones-UBS Copper ETN

Chart source: StockCharts.com.

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