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Pd=Ps+Tax=Ps+2
Ps=Pd-Tax=Pd-2
Qd=2’000-200Pd
Qs=200Ps=200(Pd-2) = 200Pd-400
Qd=Qs
2’000-200Pd=200Pd-400
2’400=400Pd
Pd=2’400/400=6
Ps=6-2=4
Qs=Qd=200Ps= 200×4=800
Demand curve doesn’t changes actually – there vertical spread emerges between demand and supply, and this spread size is tax.