6. (20%) Suppose that the demand curve for a particular commodity is QD = α-βP, where QD is the quantity demanded, P is the price, and α,βare constants, both larger than zero. The supply curve for the commodity is Qs =γ+δP, where Qs is the quantity supplied, P is the price, and γ,δare constants, δ＞ 0. Prove aleebraically that the post- tax equilibrium (consisted of a consumer price, a producer price, and the quantity associated with these prices) is the same regardless of whether the tax is imposed on consumers or producers.
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