I think a real indicator of the future prices of most metals would be gold itself. Granted, this isn't absolute.... The price of gold could go down one day and the price of copper might go up the next. However, this does remind me of a year or two ago when there were commercials all over TV about cash for gold schemes and how you could turn in your unwanted gold to pay your mortgage/alimony/child support. Then, as the price of gold started to wane a little, new commercials came on the air, featuring a well dressed actor riding a horse on a ranch somewhere telling us how he's secured his future by investing in gold, then telling us that we can too with a free pamphlet....
What this tells me is that when Larry the Cable Guy starts showing up on commercials telling us about the intrinsic value of aluminum and how we can make a better future for ourselves and our children by investing in it, we're all screwed.
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