The problem with commodities like iron is they mean-revert. Iron ore traditionally sells for under 40 cents. It's over 160. There is a big price bubble, becaus

The problem with commodities like iron is they mean-revert. Iron ore traditionally sells for under 40 cents. It's over 160. There is a big price bubble, because there was such a large spike in demand (thus a shortage, so customers bid the price up). But if demand drops, those mining trucks can't just sit idle. They run 24 hours a day, whether they are raking in money or just eking out a profit. The same goes for the 2 mile trains, container ships, loaders, and so on. Quantities won't drop a lot, so price will, right down to the cost of production. Once it hits the cost of production, companies will start scrapping trucks, but that's a very bad way to lower quantities.