It depends what kind of corruption we're talking about, nepotism and waste tend to get cleaned out pretty decently in private enterprise, but exploitation along with anti-competitive and unsafe business practices thrive.
Rep. William Mason, arguing in favor of the Sherman Antitrust Act, said: "trusts have made products cheaper, have reduced prices; but if the price of oil, for instance, were reduced to one cent a barrel, it would not right the wrong done to people of this country by the trusts which have destroyed legitimate competition and driven honest men from legitimate business enterprise."
https://en.wikipedia.org/wiki/Standard_Oil#Legacy_and_critic...
Now, business is a cruel world where luck plays a significant role in success, but it's healthy for society for us to try and keep the playing field of business as level as possible and the number of lives ruined by standard oil is a pretty heavy weight.
