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404 not found · 2024年07月08日

marginal propensity to consume

  1. CFA I
  2. Economics Analysis

NO.PZ2023071902000016

问题如下：

QuestionIn a theoretical economic model, consumer spending is 65% of pre-tax revenue, and the average taxation rate is 28% of the overall revenue. If forecasted government expenditures are projected to rise by $1.5 billion, by what amount, in billions, will the total revenue and expenditure likely increase?

选项：

A.$2.8. B.$4.3. C.$1.1.

解释：

Solution

  1. Correct.

    The fiscal multiplier is 1 1−c( 1−T ) where

    c = marginal propensity to consume = consumption/disposable income

    T = the tax rate

    Assuming pre-tax income of $1

    Disposable income: $1× (1 – 0.28) = $0.72

    Marginal propensity to consume: $0.65/$0.72 = 0.9028

    The fiscal multiplier: 1/[1 – 0.9028(1 – 0.28)] = 2.8571

    With an increase in government expenditures of $1.5 billion, total revenues and expenditures will ascend by $1.5billion × 2.8571 ≈ $4.3 billion

Fiscal Policy

• describe tools of fiscal policy, including their advantages and disadvantages

依据乘数公式，假设税前收入为1美元

可支配收入:1美元×(1 - 0.28) = 0.72美元

边际消费倾向:0.65/ 0.72 = 0.9028

财政乘数:1/[1 - 0.9028(1 - 0.28)]= 2.8571

财政支出增加15亿美元，收支总额将增加15亿美元× 28.571≈43亿美元

marginal propensity to consume C= 消费 / 收入（1-税率）

财政乘数 = 1/(1 + C * （1-税率）)

那这个公式先除个（1-税率），再乘回来折腾啥呢，不直接 1/ (1 + consumer spending is 65%)完事儿，这不简洁多了？


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1 个答案

笛子_品职助教 · 2024年07月09日

嗨，努力学习的PZer你好：


Hello，亲爱的同学~

65%的含义是：consumer spending is 65% of pre-tax revenue。消费占税前收入的65%。

而边际消费倾向：C = consumption/disposable income，即消费/税后收入。

相同的消费，想通的税前收入，不同的税率，边际消费倾向是不同的。

而边际消费倾向，又决定了财政乘数。

所以我们要使用财政乘数公式，代入数字后计算。

如果只是1/ (1 + consumer spending is 65%)，计算结果并不是 2.8571。


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努力的时光都是限量版，加油！

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