Morton Salt Company, a large producer of table salt, had an established price scale for its product based on the quantity of salt ordered in a 12-month period. Thus, a fi rm that ordered a substantial quantity of salt paid less per package than a store that ordered a smaller quantity. Acting in response to complaints from small fi rms, the Federal Trade Commission investigated and determined that the lowest price offered by Morton Salt Company, although available to all customers, was practical only for fi ve national customers who purchased in suffi ciently large quantities to benefi t from the lowest prices established. Would the alleged price discrimination be covered under the Robinson-Patman Act? [ FTC v. Morton Salt Co., 334 U.S. 37.]