IB Economics Unit 2.5: Microeconomics - Market Failure (id: a8890c345)

本题目来源于试卷: IB Economics Unit 2.5: Microeconomics - Market Failure，类别为 IB经济学

[单选题]

Using the diagram above, calculate the size of an indirect tax that would eliminate the externality, the total tax revenue that the government would collect, and the resulting equilibrium quantity after the imposition of the tax.

	Size of indirect tax per unit	Total tax revenue	Quantity bought and sold after tax
A.	$2	$ 1 400 000	700 000 unites
B.	$2	$ 1 200 000	600 000 units
C.	$1	$ 1 200 000	600 000 units
D.	$1	$ 1 400 000	700 000 units

A.
B.
C.
D.


参考答案:  B


本题详细解析:
B

The size of the indirect tax per unit that would eliminate the externality equals the vertical distance between MPB and MSB ($\text{\$}$2).

The total tax revenue that the government would collect equals:

$$ $taxperunit\times quantityboughtandsoldaftertax$

$$ $=\text{ \$}2\times 600000units$

$$ $=\text{ \$}12000000$

The price that consumers pay after the imposition of the tax is $\text{\$}$8 because the indirect tax will shift the MPC curve up until the new quantity is $600000$ units. At this quantity, the externality is eliminated and the socially optimum output is produced.

Choices A and D are incorrect because they mix the market equilibrium quantity with the socially optimum output, and overstate the tax revenue.

Choices C and D are incorrect because they mix the price paid by the consumer after the tax is imposed with the price received by the producer.

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