Wells Fargo Bank, N.A. v. Siegel, 540 F.3d 657 (7th Cir. 2008)

(plaintiff sued to collect a debt that the defendant (a farmer) owed to a third party (provider of farm products and marketing services) through its grain marketing program but which the plaintiff had acquired; trial court judgment for defendant upheld; trial court did not err in finding that defendant and third party had not entered into an agreement authorizing the trading of grain futures on the plaintiff's behalf, and in finding that the third party had kept possession of corn deliveries as collateral for a loan it paid off on the defendant's behalf).