You'll just have to trust Blawgletter that the U.S. Department of Agriculture sets minimum prices for milk producers.
Unless you want to read the 10-page SUMMARY of the process in Carlin v. DairyAmerica, Inc., No. 10-16448, slip op. at 8731-41 (9th Cir. Aug. 7, 2012).
Go ahead. We'll wait.