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On the Existence and Prevention of Speculative Bubbles

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  • Enders, Zeno
  • Hakenes, Hendrik Hakenes

Abstract

We develop a parsimonious model of bubbles based on the assumption of imprecisely known market depth. In a speculative bubble, traders drive the price above its fundamental value in a dynamic way, driven by rational expectations about future price developments. At a previously unknown date, the bubble will endogenously burst. We provide a general condition for the possibility of bubbles depending on the risk-free rate, uncertainty about market depth, and traders’ degree of leverage. This allows us to discuss several policy measures. Bubbles always reduce aggregate welfare. Among others, certain monetary policy rules, minimum leverage ratios, and a correctly implemented Tobin tax can prevent their occurrence. Implemented incorrectly, however, some of these measures backfire and facilitate bubbles.

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  • Enders, Zeno & Hakenes, Hendrik Hakenes, 2014. "On the Existence and Prevention of Speculative Bubbles," Working Papers 0567, University of Heidelberg, Department of Economics.
    • Handle: RePEc:awi:wpaper:0567
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    Cited by:

    1. Gourieroux, C. & Jasiak, J. & Monfort, A., 2020. "Stationary bubble equilibria in rational expectation models," Journal of Econometrics, Elsevier, vol. 218(2), pages 714-735.

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    Keywords

    Bubbles; Rational Expectations; Market Depth; Liquidity; Financial Crises; Leveraged Investment; Bonuses; Capital Structure.;
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