作者returnzero (返回原点)
看板EconStudy
标题Re: [问题] 请问税收乘数(tax multiplier)的问题
时间Wed Nov 23 16:15:20 2005
※ 引述《keithtroy (keithtroy)》之铭言:
: Derive a version of the "tax multiplier" from the simple
: closed economy national income identity Y=C+I+G, and
: explain its relevance, if any, for the debate over
: the public finances (debt, deficits, etc.).
: Will the multiplier have a defferent value
: in the short-run versus the long-run? How does this affect the debate?
: Tax multiplier我会导:
: Y=C+I+G
: C=c(Y-T)
: Y=[1/(1-c)][I+G-cT]
: 所以tax multiplier= - c/(1-c)
: 我想要请问的是这题的後半题~
: 这个乘数对长短期有不同的影响吗? 对debate有何影响
: 每次这种长短期的我都不大会答><
: 谢谢大家!!
以下是我的想法:
Y=C+I+G
C=C(Y-T) <---C is a Function of (Y-T)
So
dY dC dY dT dI dG
------ = ----- (----- - ------) + ------ + --------
dT d(Yd) dT dT dT dT
in case of Short-Run:
I=constant
G=constant
So
dY dC dY dT
---- = ----- (----- - -----)
dT d(Yd) dT dT
Let c = dC / d(Yd)
Yt= dY / dT
→ Yt=c(Yt-1)
→ Yt= -c/(1-c)
in case of Long-Run:
dY dC dY dT dI(Y) dG
----- = ------ (----- - -----) + ------ + ------
dT d(Yd) dT dT dT dT
Let It= dI / dT
→ Yt= c(Yt-1) + ItYt + 1
→ Yt= 1-c / (1-c-It)
所以租税乘数Yt会不相同...
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.120.73.170
※ 编辑: returnzero 来自: 140.120.73.170 (11/23 16:16)