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PZmomo · 2024年04月28日

growth rate of labor

NO.PZ2023041102000035

问题如下:

Using the specified growth accounting equation, which is the most appropriate conclusion Birol can make from his data on trends in the economy?

Exhibit 1Long-Term Trends of Daltonian Economy

选项:

A.GDP growth is primarily driven by labor. B.Daltonia’s economy is performing at a steady state rate of growth. C.Output per worker is falling.

解释:

The components of growth can be determined using Solow’s growth accounting equation: ΔY/Y = ΔA/A + αΔK/K + (1 − α)ΔL/L

TFP = Labor productivity growth – Growth in capital deepening = 1.7 – 2.3 = –0.6, which is given in Exhibit 1. Also given, 1 – α = 0.65 and α = 0.35

上课说,不能用人口增长率来代替(看到老师之前的解答,说这一题有瑕疵)

那么,可不可以算出growth rate of labor呢?


已知%Δy=1.7%,%ΔT=-0.6%,根据y=T(K/L)^α,得到%Δy=%ΔT+α%Δ(K/L),α=0.35,算出%Δ(K/L)=6.57%

K/L=K➗L,得到%Δ(K/L)=%ΔK-%ΔL,%ΔK=6.1%,算出%ΔL=-0.47%。

这种思路对吗?

2 个答案

笛子_品职助教 · 2024年04月29日

嗨,爱思考的PZer你好:


α%Δ(K/L)这个不是资本深化得到的增长吗?2.3% %Δy=%ΔT+α%Δ(K/L)是由y=T(K/L)^α取对数、求导得到的?(类似于%ΔY=%ΔT+α%ΔK+(1-α)%ΔL)不正确吗?


Hello,亲爱的同学~

同学说的这两个公式:α%Δ(K/L)与%Δy=%ΔT+α%Δ(K/L),确实在原版书和基础讲义上都没有出现过。

虽然同学说这是由一个原始公式推导出来的,但既然原版书没有出现这两个推导后的结论,那么解题的时候,也不会涉及到同学说的这两个公式。


不过同学自己推导出的公式,倒也是正确的。虽然原版书上没有写这个公式。

同学的这个算法也是比较新颖的,这是一道协会的题目,这道题的出题人,其实也没想到同学提出的这一个解法。

因为出题的规则是,只涉及到原版书上出现的公式,哪怕是运用了推导后的公式,这个推导后的公式也需要在原版书里出现才行。


只是同学不用纠结。本题考试的时候,会明确告知是labor force为3.4%,而不是人口是3.4%。

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加油吧,让我们一起遇见更好的自己!

笛子_品职助教 · 2024年04月29日

嗨,努力学习的PZer你好:


上课说,不能用人口增长率来代替(看到老师之前的解答,说这一题有瑕疵)

那么,可不可以算出growth rate of labor呢?


Hello,亲爱的同学~

这道题的劳动力没有已知,就像老师上课的时候说的,使用人口增长来近似替代就好。

这题是不能计算出劳动力的。


同学的公式:%Δy=%ΔT+α%Δ(K/L),这个公式不正确的哈。

并不存在这个公式。


而且同学计算出来的%Δ(K/L)=6.57%是人均资本,这个数值题目是已知的,就是:


同学根据老师上课的时候提供的解法就好。

考试的时候会明确告知劳动力增长率的数值的,考试出题,会非常严谨。同学不用纠结。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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