monopolies, however, aren't always bad.
In the non-existent, theoretical "True Capitalism", a monopoly can only exist if a company is creating a product that everyone wants to buy as opposed to the competition. Because the market remains open, as soon as someone could provide a better product at a better price or fill a niche not covered in the market, they are able to and they can easily break the monopoly. Obviously there are 1000 reasons why that isn't how it works.
This reminds me of a talk I heard Naomi Klien give at the start of this recession on Democracy Now! I disagree with Klien on a lot of issues, though this one point she made really rang true with me. Lefties have had to come to terms with the collapse of "true communism" or "True socialism". We have seen that irrational people cannot make these idealistic systems work, and left wing ideology has become much more pragmatic in response to this, creating almost a "post-socialism" that people refer to as social democracy or other such names. The same needs to happen on the right. The market is a powerful tool, but we conservatives need to forget the rhetoric that probably was what initially sold us on the free market, because it doesn't work in practice. And like Communism, it isn't that the political theory is inherently mistaken about how things could work, it is that the ideology assumes, I guess as sym said, that people are rational actors.