Tom C. Clark,
Tampa Electric Company v. Nashville Coal Company…
“ Although the effect on competition will be quantitatively the same if a given volume of the industry's business is assumed to be covered, whether or not the affected sources of supply are those of the industry as a whole or only those of a particular region, a purely quantitative measure of this effect is inadequate because the narrower the area of competition, the greater the comparative effect on the area's competitors. ”
