Suppose a market is in equilibrium at price P0, and then an excise tax of t dollars per unit of the good is imposed. At a price of (P0 + t) there will be excess for the good unless the demand curve is .
A) supply; vertical
B) demand; horizontal
C) demand; vertical
D) tax; unit elastic
E) supply; horizontal

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The Answer of Suppose a market is in equilibrium at price P0, and then an excise tax of t dollars per unit of the good is imposed. At a price of (P0 + t) there will be excess for the good unless the demand curve is .
A) supply; vertical
B) demand; horizontal
C) demand; vertical
D) tax; unit elastic
E) supply; horizontal

Suppose a Market Is in Equilibrium at Price P0, and Then