MEGAN MCARDLE:

There’s also this dodgy belief, fervently embraced by many liberals advocating regulations–“Look, even a big business head who would be regulated believes it’s a good idea! It must be!” Au contraire, mon frere. The heads of big businesses often love big new regulatory bodies, because they have the resources to best negotiate a complex regime. The end result of this kind of radical regulation is usually that the big companies capture the regulator and use it to shut out competition.

Really big companies are more like bureaucracies than capitalist enterprises. See, e.g., Dilbert.