Free reigning capitalism ends in a single party monopolizing essential supplies. Be the first to monopolize drinking water or oil production and most will do your bidding, lest their living standard plummets. You can leverage the power you have gained and obtain more monopolies. It will mean slavery and eugenic programs; the worst of all dystopias combined.

Capitalism is amoral and must be kept in check by a government that looks after its people and upholds their moral standards. Otherwise, it ends in what is essentially a monarchy, but worse, because driven only to acquire more capital, with no regards for any morals at all.