On the chart, it seems that from 90-80 the short-term speculators drove it up, nothing but air supported it and they had to get out before they got a deliverable.
Then, you had long-term speculators still in it, long-term they can only support a price twice as high as the people who are buying the contract for delivery support all by themselves (since they will have to sell it to someone wanting a deliverable before expiration of the contract - long-term speculators can't support a price more than twice what it would be without them there seems to me). So, that puts us at 1/2 of 80, which is 40, which is where it's sitting.
There's of course, supply-side glut of supply that can interfere, but I figure long-term that takes care of itself, since farmers plant less of it when it's cheap.
Then, there's demand destruction, and that's the real question mark right now isn't it.
Please critique this analysis. I want to learn.