The free market is a neoliberal fairy tale. A mystical idea. A hypothetical concept. There are no markets anywhere which are unsullied by the "dirty" touch of government in this reality.
Government intervention also covers such a broad range of things that you can't lump them under one umbrella.
Governments routinely create competition in some markets and suppress it in others and prices behave accordingly.
This idea doesnt fit in a soundbite unfortunately but "government bad, regulations bad, markets good" is catchy. Thats why this soundbite message was carefully marketed to an American audience by Koch think tanks in response to their epic fights with the environmental protection agency.