7 U.S.C. § 206

Rates and charges generally; discrimination

All rates or charges made for any stockyard services furnished at a stockyard by a stockyard owner or market agency shall be just, reasonable, and nondiscriminatory, and any unjust, unreasonable, or discriminatory rate or charge is prohibited and declared to be unlawful: Provided , That rates and charges based upon percentages of the gross sales prices of livestock shall not be prohibited merely because they are based upon such percentages rather than on a per head basis.

( Aug. 15, 1921, ch. 64 , title III, § 305, 42 Stat. 164 ; Pub. L. 95–409, § 1(a) , Oct. 2, 1978 , 92 Stat. 886 .)