Why States won't implement a sustained free market:

States must maintain internal stability to maintain its ability to wage war. The State has an incentive to reallocate its resources to maintain internal stability. A free market will mean reduced services to the least privileged of society which will lead to increased social unrest. A free market will also present members of the same tribe with stark examples of the haves-vrs-the-have-nots which will breed contempt and more social unrest. The State, therefore, has an incentive to be seen as providing a safety net and social securities. (Look at histories best examples of free markets - the US, Sinagpore, Hong Kong, a free market is societies sprint, not its marathon.)