Perhaps this, and the related book, will explain it better: http://www.fee.org/nff/the-myth-of-the-robber-barons/
If you don't like my reading suggestions, then perhaps try a Milton Friedman youtube video:
And you say that like it's a bad thing, when in reality we could use a healthy dose of economic conservatism right now.
Ah, I do love you right-wingers. At the very moment we're overdosing on your ideology, you insist that it has never been tried and is needed more than ever!