His ideas are failed ideas for the most part.
He has been a republican fringe guy and will never win national election because his ideas do not resonate with enough American voters.
You can say his ideas are untested in the modern world, but you certainly can't call them failed. They can only fail if they're attempted.
What you fail to understand is that it has been untested because it doesnt work.
Unfettered markets lead to consoilidation of wealth in fewer and fewer hands which in the end kills any attempt at democracy.
They are failed ideas.
They have been tried and they failed very quickly by turning into a wealth grab every time.
What you dream of can never happen.
It is unsustainable as a policy.