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So do you believe in *no* price controls whatsoever, or limited price controls? Are there times when price controls might be necessary or just?

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"Necessary" depends on who you ask. Clearly, they can never be just. If two parties voluntarily agree on a transaction, what business is it of anyone else?

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Depends on the intended transaction. In an open market with a true barter system, this is entirely true. What if the merchant selling the good has no bartering power and all providers of the product offer at the same price?