The alleged purpose of the Antitrust laws was to protect competition; that purpose was based on the socialistic fallacy that a free, unregulated market will inevitably lead to the establishment of coercive monopolies. But, in fact, no coercive monopoly has ever been or ever can be established by means of free trade on a free market. Every coercive monopoly was created by government intervention into the economy: by special privileges, such as franchises or subsidies, which closed the entry of competitors into a given field, by legislative action. (For a full demonstration of this fact, I refer you to the works of the best economists.)
A “coercive monopoly” is a business concern that can set its prices and production policies independent of the market, with immunity from competition, from the law of supply and demand. An economy dominated by such monopolies would be rigid and stagnant.
The necessary precondition of a coercive monopoly is closed entry — the barring of all competing producers from a given field. This can be accomplished only by an act of government intervention, in the form of special regulations, subsidies, or franchises. Without government assistance, it is impossible for a would-be monopolist to set and maintain his prices and production policies independent of the rest of the economy. For if he attempted to set his prices and production at a level that would yield profits to new entrants significantly above those available in other fields, competitors would be sure to invade his industry.