Faith in Free Markets

Faith in Free Markets:
I agree, then, that economists have faith in free markets. We can’t prove that free markets will generate a better result. But we’ve observed them long enough to have faith in them. We believe, with faith and evidence, that free markets provide the most prosperity for the most people.
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I’d love to know where they found a free market to have faith in. I’ve never seen one that wasn’t structured, biased or otherwise guaranteed by governmental or corporate structures.