Summary

Portrait of Tom C. Clark 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.
Source: Wikisource

Portrait of Tom C. Clark Tom C. Clark Tampa Electric Company v. Nashville Coal Company…

To determine substantiality in a given case, it is necessary to weigh the probable effect of the contract on the relevant area of effective competition, taking into account the relative strength of the parties, the proportionate volume of commerce involved in relation to the total volume of commerce in the relevant market area, and the probable immediate and future effects which pre-emption of that share of the market might have on effective competition therein.
Source: Wikisource

Portrait of Tom C. Clark Tom C. Clark Tampa Electric Company v. Nashville Coal Company…

We are persuaded that on the record in this case, neither peninsular Florida, nor the entire State of Florida, nor Florida and Georgia combined constituted the relevant market of effective competition. We do not believe that the pie will slice so thinly. By far the bulk of the overwhelming tonnage marketed from the same producing area as serves Tampa is sold outside of Georgia and Florida, and the producers were 'eager' to sell more coal in those States.
Source: Wikisource

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