Giant companies are incentivized to kill the competition and then jack up prices while also lobbying for their interests with lawmakers. Said markets will also only give you the choice between products that you don't want, when you really want something that only a government would take on. Another thing that is distorted is that if a transnational corporation has a factory in one country, sends it to one of their factories in another country, and then sends it back again because it's cheaper, that gets counted as international trade. It's hardly an export, it's a way to protect investors from having to pay market rates.. Corporations get massive protections from government, I wouldn't really call it optimal resource distribution if government interference