試題詳解

2. Suppose a tax of $4 per unit is imposed on a good, and the tax causes the equilibrium quantity of the good to decrease from 2,000 units to 1,700 units. The tax decreases consumer surplus by $3,000 and decreases producer surplus by S4,400. The deadweight loss of the tax is
(A) $ 200.
(B) $ 400.
(C) $ 600.
(D) $ 1,200.