为什么这道题代入R 的时候代的是3而不是3%?

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.

为什么这道题代入R 的时候代的是3而不是3%?

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笛子_品职助教 · 2024年09月23日

嗨，从没放弃的小努力你好：

为什么这道题代入R 的时候代的是3而不是3%?

Hello，亲爱的同学~

这里把%当作单位，因此代入的是3。

把%当作单位，这是财政开支对GDP刺激，这种计算里的特定处理方式，同学就根据这道题目记忆一下。

----------------------------------------------
努力的时光都是限量版，加油！

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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. 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

2024-09-15 19:33 1 · 回答

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. 解题思路里面从联立方程得出0.14Y = 4,200 – 25 × r.，到增加政府支出1000变为Y = 5,200 – 25 × r.，这是不对的。因为0.14Y = 4,200 – 25 × r.这个公式是从Y=C+I+G三个函数合并项整理出来的。在Y=C+I+G这个线性方程中，在这个题里面G是与C和I的变化无关的独立常数=1000。那么现在常数增加1000，Y就是应该增加1000呀。

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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. 这题不经过计算直接根据财政乘数放大了政府支出，G的增长肯定是大于2000也可以吧

2023-08-23 13:25 1 · 回答

为什么这道题代入R 的时候代的是3而不是3%?

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