Free markets have zero incentive to correct for negative externalities by themselves. Free markets also want to become non-free through monopolization. These ar

Free markets have zero incentive to correct for negative externalities by themselves. Free markets also want to become non-free through monopolization. These are the two classic cases of market failure, and the reason no actual economist (or, really, anyone who has read and understood an Econ 101 textbook) believes in unregulated free markets.