In Brannan v. Stark, 342 U.S. 451 (1952), the Court invalidated regulations providing certain payments to cooperatives that had the effect of reducing the blended price to nonmember producers. The premise underlying our holding was that these payments would have to represent compensation for rendering of economic services of benefit to all producers. Even the dissenters took as a point of departure the proposition that the payments could be sustained only if justified in terms of services rendered. See Brannan v. Stark, supra.