Rational and Near-Rational Bubbles Without Drift
This article derives a general class of intrinsic rational bubble solutions in a Lucas-type asset pricing model. I show that the rational bubble component of the price-dividend ratio can evolve as a geometric random walk without drift, such that the mean of the bubble growth rate is zero. Driftless bubbles are part of a continuum of equilibrium solutions that satisfy a period-by-period no-arbitrage condition. I also derive a near-rational solution in which the agent's forecast rule is under-parameterised. The near-rational solution generates intermittent bubbles and other behaviour that is quantitatively similar to that observed in long-run US stock market data. Copyright (C) The Author(s). Journal compilation (C) Royal Economic Society 2010.
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Volume (Year): 120 (2010)
Issue (Month): 549 (December)
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