Supply and demand is not just a "model", it applies to everything on this earth, as if it were a natural law. You can either work with it or against it. If you work against it you will eventually fail. You can create a differing "model" but eventually the cracks in your model will be due to economic rules that have more power than you do.
By the end of the USSR, a third of the food produced was sold illegally on black markets.
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