Example 3: B manufactures and sells a brand of laundry detergent for home use. In one metropolitan area, B's detergent is sold by a grocery store and a discount department store. If these stores compete with each other, any allowance, service or facility that B makes available to the grocery store should also be made available on proportionally equal terms to the discount department store.

(a) The label of any packaged consumer commodity which bears a representation as to the number of servings, uses, or applications of such commodity contained in such package shall bear in immediate conjunction therewith, and in letters the same size as those used for such representations, a statement of the net quantity (in terms of weight or mass, measure, or numerical count) of each such serving, use, or application: Provided,