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Yvonne0719 · 2024年09月15日

请问下Y=C+I+G这个知识点具体在哪里?另外看不太懂解析,能否再详解一遍,谢谢

NO.PZ2023010401000128

问题如下:

In a simple economy with no foreign sector, the following equations apply

If the real interest rate is 3% and government spending increases to 2,000, the increase in aggregate income will be closest to:

选项:

A.1,000.00 B.1,163. C.7,143.00

解释:

Y = 4,200 + 0.86 × Y – 25 × r.

Y = 30,000 – 178.6 × r.

At 3%, Y = 30,000 – 178.6 × 3 = 29,464.

Alternatively, Y – 0.86Y = 4,200 – 25 × r

0.14Y = 4,200 – 256 × r.

If government spending increased by 1,000 to 2,000, then Y = 5,200 + 0.86 × Y – 25 × r.

Y = 37,142 – 178.6 × r, which at 3% would be Y = 37,142 – 178.6 × 3 = 36,607.

Representing an increase of 36,607 – 29,464 = 7,143.

Alternatively, at 5,200, Y – 0.86Y = 5,200 – 25 × r or 0.14 Y = 5,200 – 25 × r.

Or more simply, ∆G ÷ (1 – c) = 1,000/(1 – 0.86) = 7,143.

请问下Y=C+I+G这个知识点具体在哪里?另外看不太懂解析,能否再详解一遍,谢谢

1 个答案

笛子_品职助教 · 2024年09月16日

嗨,努力学习的PZer你好:


请问下Y=C+I+G这个知识点具体在哪里?

Hello,亲爱的同学~

这里需要同学先理解GDP的计算公式。

在支出法下,GDP = C+I+G+(M-X)

其中,C指私人消费,I指私人投资,G指政府支出,M-X= 出口-进口 = 净出口

如果不考虑外国部门,也就是不考虑M-X,则GDP就等于前三项,即GDP = C+I+G。


这部分知识点由于太过基础,原版书里放到了背景介绍里面,正文不再保留。

何老师在讲解贸易平衡这一章时,提到了这个公式。

用支出法GDP公式:GDP = C+I+G+(M-X)

与收入法GDP公式:GDP =C +S +T

推导出:X-M = S-I + T-G


同学这里稍作了解就可以,等学到Trade Balance的时候,再详细学习。


另外看不太懂解析,能否再详解一遍,谢谢

可以的,解析里把很多中间过程的计算放进来了,导致同学看不懂。

我们直接省去中间步骤,就可以清晰很多。


我们把表格里的C、I、G,都代入Y = C+I+G的表达式,可以得出:


这是G =1000的情形,我们把r=3代入,就是一个关于Y的一元一次方程。

解方程计算,可以得出Y = 29,464


把上述方程的1000改为2000,也是r=3代入,得出的方程为:

这也是关于Y的一元一次方程,解方程,Y = 36,607


两者相减,36,607 - 29,464 = 7,143






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二狗 · 2024年11月12日

aggregate income是GDP的意思??

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NO.PZ2023010401000128 问题如下 In a simple economy with no foreign sector, the following equations applyIf the realinterest rate is 3% angovernment spenng increases to 2,000, the increase inaggregate income will closest to: A.1,000.00 B.1,163. C.7,143.00 Y = 4,200 + 0.86 × Y – 25 × r. Y = 30,000 – 178.6 × r. 3%, Y = 30,000 – 178.6× 3 = 29,464. Alternatively, Y – 0.86Y= 4,200 – 25 × r 0.14Y =4,200 – 256 × r.If governmentspenng increase1,000 to 2,000, then Y = 5,200 + 0.86 × Y – 25 × r. Y = 37,142 – 178.6 × r, whi3% woulY =37,142 – 178.6 × 3 = 36,607. Representing increase of 36,607 – 29,464 =7,143. Alternatively, 5,200, Y – 0.86Y = 5,200 – 25 ×r or 0.14 Y = 5,200 – 25 ×r. Or more simply, ∆G ÷ (1 – = 1,000/(1 – 0.86) =7,143. 为什么这道题代入R 的时候代的是3而不是3%?

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