Unlike political power, which entails fear and punishment, economic power entails incentives and rewards. Should a businessman initiate force, he is, precisely to that extent, a criminal, not some economic power-lord. Should a criminal take some time out to earn some wealth instead of stealing it, to that extent he is in business, working in a creative role. Economic power involves trading benefits with whomever you choose to deal and with whoever chooses to deal with you. That is, it involves the power to harm no one .
Political power is the power of a gun of police, the military, the taxman and the jailer.
Should you flout the law, whether a just law or an antitrust law, you must submit. If people value his products and services, they'll freely contract with him for them. The fact that someone might possess more economic power or resources than another may effect the terms of a deal, but it doesn't alter the fact that the deal is entirely economic, a completely voluntary trade. For those of you still unclear about these distinctions, let me suggest an experiment. After you graduate from Harvard, during your first year in the workforce, don't buy or use any of Microsoft's products.