Meanwhile, corporations frequently do not have to compete, having either become a monopoly or having agreed upon "standards" without which they insist solvency in their given area would be impossible (as they rake in untold riches in profit). The only check on that power is indirectly through refusing to transact with them en masse. However, as long as their credit is good, they can continue to exist and operate with impunity.
In the end, the question is of the accumulation of which currency determines who is "good" enough to run your life: political clout or money.
Franklu, people who have to be nice to me tend to do better by me than people who just happen to have a lot of money.
Companies are controlled by the market, it's governments we need to worry about and find ways to control and regulate.
Companies are remarkably good at finding ways to control the market. That's why antitrust legislation is needed to protect consumers.
Every government intervention in the market will benefit established players and will hinder startups and thus the markets's self-regulating mechanisms.
There are many other cases where I'd be very uncomfortable trusting these so-called "self-regulatinf mechanisms", e.g. the abolition of slavery, child labour, and racial/sexual employment discrimination.