Right here where I live, Wal Mart did this very thing; putting every mom and pop business out of business on the town-square. Every time a new paint store or fabric store tries to open up, Wal Mart lowers its prices and puts them out of business. It doesn't take a genius to figure out that if someone comes to town with one hundred billion dollars, he will eventually own the town. Another thing, you like the fantasy of a free market utopia where everyone is honest and loving and caring. Sorry, but those same loving, honest, caring individuals can be bought for a price. If you don't believe me, just look at the drug cartels, which is an example of a "free market" with no subsidies and regulations.
edit: the bottom line is that people can be bought. You don't have a central government and you have free trade and everybody's happy? Don't worry, wealthy people can change all that.