Maybe that copper commodity price theory posted yesterday was a good one
"Does it matter if copper breaks down? In the normal course of things I would say no. The demand side is slipping on a global basis; there’s plenty of metal around, so lower prices are not much of a surprise. But there is a wild card on copper this time around. I’m wondering if the crap out in copper is going to bring indigestion to China."
"Entities in China have been using copper warehouse stocks as collateral for financing all manner of things for the past two years (L/C backed financing). The estimates for how much has been done of this are not clear. The range is from $7-10 billion."