Market Bubbles and Chrashes

Taisei Kaizoji () and Didier Sornette

MPRA Paper from University Library of Munich, Germany

Abstract: Episodes of market crashes have fascinated economists for centuries. Although many academics, practitioners and policy makers have studied questions related to collapsing asset price bubbles, there is little consensus yet about their causes and effects. This review and essay evaluates some of the hypotheses offered to explain the market crashes that often follow asset price bubbles. Starting from historical accounts and syntheses of past bubbles and crashes, we put the problem in perspective with respect to the development of the efficient market hypothesis. We then present the models based on heterogeneous agents and the limits to arbitrage that prevent rational agents from bursting bubbles before they inflate. Then, we explore another set of explanations of why rational traders would be led to actually profit from and surf on bubbles, by anticipating the behavior of noise traders or by realizing the difficulties in synchronizing their actions. We then end by discussing a complex system approach of social imitation leading to collective market regimes like herding and the phenomenon of bifurcation (or phase transition) that rationalize what crash can occur in unstable market regimes. The key insight is that diagnosing bubbles may be feasible when taking into account the positive feedback mechanisms that give rise to transient “super-xponential” price growth, the bubbles.

Keywords: Financial bubbles; crashes; efficient market hypothesis; positive feedback; noise traders; super-exponential; heterogeneous beliefs; synchronization failure; social imitation; complex system theory; collective phenomena; bifurcation; phase transition (search for similar items in EconPapers)
JEL-codes: G14 G11 G12 (search for similar items in EconPapers)
Date: Written
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Related works:
Working Paper: Market bubbles and crashes (2008)
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