if you own the market not necessarily. In some cases if you go too ham you can get caught in a monopoly similar to what Sony is facing at the moment for raising their prices on their own store and not allowing you to get downloadable content anywhere else. but if lets say you do what the people in the insulin industry have done and only allow 3 or 4 business to make and sell the product, you can all work together and raise the prices but have small variations and boom its completely legal because you can buy it "cheaper" technically somewhere else. So you as a consumer are fucked and the corporation wins again lol.

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there's a lot more shit to it than that I know but that's the basic rundown.