A free market is like an OS without memory protection. Every process can scratch in memory everywhere they want. Some may like it, but for most people it's just terrible.
Or, you know, any actual market. Where I can sell whatever I want from my stall but I can't sabotage other people's stalls.
Oh, if you sell in your stall oranges at 10c box, with plenty of stock, you will sabotage the other stall selling fruit. And you can do that because your actual business is another one.