中級(jí)宏觀經(jīng)濟(jì)學(xué)上海財(cái)經(jīng)大學(xué)經(jīng)濟(jì)學(xué)院沈凌05growth-閱讀頁(yè)
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【正文】 19 LongRun Economic Growth ? Exogenous Technological Progress ? ?k/k= s(y/ k)* ? sδ ? n ? s[n+g/(1?α)] ? For CobbDouglas function ???????????????11)1/(gnssAkMacroeconomics Chapter 5 20 LongRun Economic Growth Macroeconomics Chapter 5 21 LongRun Economic Growth Macroeconomics Chapter 5 22 LongRun Economic Growth Macroeconomics Chapter 5 23 Endogenous Growth Theory ? Extend the model to explain why technological progress occurs. ? Most endogenous growth models focus on investments in research and development (Ramp。D ? Support for basic scientific research ? Private incentives for Ramp。D model ? Assumptions 1. The labor force is the single production factor 2. Generalized CobbDouglas function without capital )()1)(()( tLatAtY L??3. The fraction of the labor force is exogenous Macroeconomics Chapter 5 29 The basic Ramp。D model ? The dynamic of knowledge accumulation 1)()]([)()()( ??? ?? tAtLaBtAtAtgLA?)()1()( )( tgntg tg AAA ??? ???Macroeconomics Chapter 5 31 The basic Ramp。D model ? Case 1: 1?????? 1* ngALa has a level effect but not a growth effect Interpretation: ? endogenous long run growth rate 1. positive link with population growth 2. Macroeconomics Chapter 5 33 The basic Ramp。D model ? Case 3: 1??Ag?Ag linear growth model Lahas a growth effect
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