Competition
The magic that makes capitalism work is competition. According to Axelrod, in The Evolution of Competition with less than 26 competitors, you get co-operation and de facto price fixing. Corporations naturally seek to increase profit by reducing competition through mergers and acquisitions. Left to itself, capitalism collapses into an oligarchy or monopoly, which then tries to convince everyone not to interfere with the impaired free market forces. If you value free market capitalism, you must necessarily support regulation to preserve competition.
~ Roedy (1948-02-04 age:70)