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AS-AD in the Standard Dynamic Neoclassical Model: Business Cycles and Growth Trends

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The paper shows how a dynamic neoclassical AS-AD can be derived and used to describe business cycles and growth trends to undergraduates. Derived within the Ramsey-Cass-Koopmans (RCK) model, the AS-AD is the stationary equilibrium of the deterministic dynamic general equilibrium framework. Allowing Solow exogenous growth, the AS-AD is derived along the balanced growth path equilibrium. The derivation first builds consumption demand, aggregate demand, and then aggregate supply through the equilibrium conditions and a closed form solution for the capital stock. Through a comparative static change in goods sector productivity, the paper shows the basic failing of the standard RBC model. Allowing a second comparative static change in the consumer's time endowment, this captures a change in the "external margin" of labor supply. These comparative statics enable explanation of the business cycle, and "Solow-plus" growth trends including education time and working time. In extension of RCK, the paper shows beyond the undergraduate level, how to derive AS-AD when including human capital and endogenous growth. This allows an endogenous change in the time endowment for work and leisure through a change in human capital productivity, with a similar but more fundamental AS-AD story of business cycles and growth trends.

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  • Gillman, Max, 2012. "AS-AD in the Standard Dynamic Neoclassical Model: Business Cycles and Growth Trends," Cardiff Economics Working Papers E2012/12, Cardiff University, Cardiff Business School, Economics Section.
    • Handle: RePEc:cdf:wpaper:2012/12
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    1. Gillman, Max, 2021. "Steps in industrial development through human capital deepening," Economic Modelling, Elsevier, vol. 99(C).

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    More about this item

    Keywords

    Ramsey-Cass-Koopmans; supply; demand; state variable;
    All these keywords.

    JEL classification:

    • A22 - General Economics and Teaching - - Economic Education and Teaching of Economics - - - Undergraduate
    • A23 - General Economics and Teaching - - Economic Education and Teaching of Economics - - - Graduate
    • E13 - Macroeconomics and Monetary Economics - - General Aggregative Models - - - Neoclassical

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