Many people believe that possession of unchallenged economic power deadens initiative, discourages thrift and depresses energy; that immunity from competition is a narcotic, and rivalry is a stimulant, to industrial progress; that the spur of constant stress is necessary to counteract an inevitable disposition to let well enough alone. Such people believe that competitors, versed in the craft as no consumer can be, will be quick to detect opportunities for saving and new shifts in production, and be eager to profit by them. […] True, it might have been thought adequate to condemn only those monopolies which could not show that they had exercised the highest possible ingenuity, had adopted every possible economy, had anticipated every conceivable improvement, stimulated every possible demand. No doubt, that would be one way of dealing with the matter, although it would imply constant scrutiny and constant supervision, such as courts are unable to provide. Be that as it may, that was not the way that Congress chose; it did not condone “good trusts” and condemn “bad” ones; it forbad all.

Learned Hand (1872-1961) American jurist
United States v. Aluminum Co. of America, 148 F.2d 416, 427 (1945)