IB Economics Unit 2.4: Microeconomics - Government Intervention (id: 0b98b12bd)

本题目来源于试卷: IB Economics Unit 2.4: Microeconomics - Government Intervention，类别为 IB经济学

[单选题]

Using the diagram above, calculate the size of the welfare loss and the total cost of the subsidy that the government should provide so that the market will achieve allocative efficiency.

	Size of welfare loss	Total cost of subsidy
A.	$ 200 000	$1 400 000
B.	$ 200 000	$ 1 200 000
C.	$ 100 000	$ 1 200 000
D.	$ 100 000	$ 1 400 000

A.
B.
C.
D.


参考答案:  D


本题详细解析:
D

To calculate the size of the welfare loss:

$$ ${\displaystyle \frac{1}{2}}\times base\times height$

$$ $={\displaystyle \frac{1}{2}}\times (\text{\$}7-\text{\$}5)\times (700000-600000)=\text{\$}100000$

The cost of the subsidy is calculated using this equation:

$$ $subsidyperunit\times equilibriumquantitypostsubsidy$

$$ $=\text{\$}2\times 700000$ units

$$ $=\text{\$}1400000$

Choices A and B overstate the welfare loss.

Choices B and C multiply the correct subsidy per unit by the incorrect quantity.

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