If a per unit tax is imposed but the quantity supplied and demanded does not change, then:

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When a per unit tax is imposed but the quantity supplied and demanded does not change, it indicates that both the demand and supply are perfectly inelastic, meaning consumers and producers will buy or sell the same amount regardless of price changes. This situation also means there is no deadweight loss, as the market efficiency does not change due to the tax.

If a Per Unit Tax Is Imposed but the Quantity