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Rational Bubbles in Non-Linear Business Cycle Models: Closed and Open Economies

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  • Kollmann, Robert

Abstract

This paper studies rational bubbles in non-linear dynamic general equilibrium models of the macroeconomy. The term ‘rational bubbles’ refers to multiple equilibria arising from the absence of a transversality condition (TVC) for capital. The lack of TVC can be due to an overlapping generations structure. Rational bubbles reflect self-fulfilling fluctuations in agents’ expectations about future investment. In contrast to explosive rational bubbles in linearized models (Blanchard (1979)), the rational bubbles in non-linear models here are stable and bounded. Bounded bubbles can generate persistent fluctuations of real activity, and capture key business cycle stylized facts. Both closed and open economies are analyzed. In a non-linear two-country model with integrated financial markets, bubbles must be perfectly correlated across countries.

Suggested Citation

  • Kollmann, Robert, 2020. "Rational Bubbles in Non-Linear Business Cycle Models: Closed and Open Economies," CEPR Discussion Papers 14367, C.E.P.R. Discussion Papers.
    • Handle: RePEc:cpr:ceprdp:14367
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    More about this item

    Keywords

    Rational bubbles; Boom-bust cycles; Business cycles in closed and open economies; Non-linear dsge models; Long-plosser model; Dellas model;
    All these keywords.

    JEL classification:

    • E1 - Macroeconomics and Monetary Economics - - General Aggregative Models
    • E3 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles
    • F3 - International Economics - - International Finance
    • F4 - International Economics - - Macroeconomic Aspects of International Trade and Finance
    • C6 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling

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