Hugo Black,
Federal Trade Commission v. Morton Salt Company…
“ It would greatly handicap effective enforcement of the Act to require testimony to show that which we believe to be self-evident, namely, that there is a 'reasonable possibility' that competition may be adversely affected by a practice under which manufacturers and producers sell their goods to some customers substantially cheaper than they sell like goods to the competitors of these customers. This showing in itself is sufficient to justify our conclusion that the Commission's findings of injury to competition were adequately supported by evidence. ”
