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Right now, the only sugar ETP available is iPath DJ-UBS Sugar TR Sub-Index ETN ( SGG).
FORBES: SGG Is A Sweet Buy
You could, for example, buy the iPath Dow Jones-AIG Lead Total Return Sub-Index or PowerShares DWA Emerging Markets Technical Leaders.
FORBES: How To Avoid ETF Pitfalls
One of the best ways to trade copper prices besides futures contracts is the iPath Dow Jones-UBS Copper Sub-Index Total Return ETN ( JJC).
FORBES: A Panic Low in Copper, FCX?
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