Changing the free market isn't going to magically make things cheaper.
Yeah, that's typically not the point of changing the free market, we want to encourage competition by making sure that companies can't use their gigantic financial clout to drive competitors out of the market. Things becoming cheaper is a side effect, what people would like more is if giant companies had incentive to innovate and compete instead of just driving smaller guys out of business or just absorbing them whole.
That, and the U.S. doesn't even have a completely free market in the first place, there are government subsidies, regulations, and etc. that pretty much throw out the notion of a completely free market out the window. You know what you get with a free market? Monopolies.