NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Lecture Notes on Economic Growth(I): Introduction to the Literature and Neoclassical Models

Xavier Sala-i-Martin

NBER Working Paper No. 3563
Issued in December 1990
NBER Program(s):   EFG

This is a survey of the literature on Economic Growth. In the introduction we analyze the main differences between exogenous and endogenous growth models using fixed savings rate analysis. We argue that in order to have endogenous growth there must be constant returns to the factors that can be accumulated. A graphical tool is then developed to show that changes in the savings rate have different effects on long run growth in the two kinds of models; we show that only endogenous growth models are affected by shifts in the savings rate. We then explore two versions of the Raasey-Cass-Koopmans neoclassical model where savings are determined optimally; one with exogenous productivity growth and one without.

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Document Object Identifier (DOI): 10.3386/w3563

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