Summary

Joseph McKenna National Cotton Oil Company v. Texas…

It is common-place to say that it is the purpose, and indeed duty, of government, to get all it can of good out of the activities of men, and limit or forbid them when they become or tend to evil. Of course, what is evil may not be always clear; but to be able to dispute the policy of a law is not to establish its invalidity. It is certainly the conception of a large body of public opinion that the control of prices through combinations tends to restraint of trade and to monopoly, and is evil.
Source: Wikisource

Joseph McKenna National Cotton Oil Company v. Texas…

The foundations of the belief we are not called upon to discuss, nor does our purpose require us to distinguish between the kinds of combinations or the degrees of monopoly. It is enough to say that the idea of monopoly is not now confined to a grant of privileges. It is understood to include a 'condition produced by the acts of mere individuals.' Its dominant thought now is, to quote another, 'the notion of exclusiveness or unity;' in other words, the suppression of competition by the unification of interest or management, or it may be through agreement and concert of action.
Source: Wikisource

Joseph McKenna National Cotton Oil Company v. Texas…

And the purpose is so definitely the control of prices that monopoly has been defined to be 'unified tactics with regard to prices.' It is the power to control prices which makes the inducement of combinations and their profit. It is such power that makes it the concern of the law to prohibit or limit them. And this concern and the policy based upon it has not only expression in the Texas statutes; it has expression in the statutes of other states and in a well-known national enactment. According to them, competition, not combination, should be the law of trade.
Source: Wikisource

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