Learning the CAPM through Bubbles
Bubbles are generally considered the outcome of investor irrationality or informational asymmetry, both objectionable in efficient markets with rational investors. We introduce an Intertemporal-CAPM with market clearing between high- and low-risk-averse rational investors who learn the CAPM under incomplete, yet symmetric information. Periodic equilibrium prices make a lognormal price process that nests the classic CAPM with a potential for endogenous bubbles through learning. The absence of comparables through the introductory phase of new technologies results in unstable return dynamics that might burst to bubbles or decline to near-zero, â€œpink-sheetâ€ valuations. When the technology shifts phase to generate real profits the return dynamics is convergent, revealing the classic CAPM. Once the real technology return is observable, over- and under-pricing can be assessed, resulting in prompt positive or negative price adjustments toward the CAPM valuation. Correspondence with the Abreu and Brunnermeier (2003) model of bubbles with rational arbitrageurs is presented as well.
|Date of creation:||11 Aug 2004|
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- Allen, Franklin & Gorton, Gary, 1993. "Churning Bubbles," Review of Economic Studies, Wiley Blackwell, vol. 60(4), pages 813-36, October.
- Coles, Jeffrey L. & Loewenstein, Uri & Suay, Jose, 1995. "On Equilibrium Pricing under Parameter Uncertainty," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 30(03), pages 347-364, September.
- De Bondt, Werner F M & Thaler, Richard H, 1987. " Further Evidence on Investor Overreaction and Stock Market Seasonalit y," Journal of Finance, American Finance Association, vol. 42(3), pages 557-81, July.
- De Long, J Bradford, et al, 1990.
" Positive Feedback Investment Strategies and Destabilizing Rational Speculation,"
Journal of Finance,
American Finance Association, vol. 45(2), pages 379-95, June.
- J. Bradford De Long & Andrei Shleifer & Lawrence H. Summers & Robert J. Waldmann, 1989. "Positive Feedback Investment Strategies and Destabilizing Rational Speculation," NBER Working Papers 2880, National Bureau of Economic Research, Inc.
- Dilip Abreu & Markus K. Brunnermeier, 2002.
"Bubbles and crashes,"
LSE Research Online Documents on Economics
24905, London School of Economics and Political Science, LSE Library.
- Feldman, David, 1989. " The Term Structure of Interest Rates in a Partially Observable Econom y," Journal of Finance, American Finance Association, vol. 44(3), pages 789-812, July.
- Merton, Robert C, 1973. "An Intertemporal Capital Asset Pricing Model," Econometrica, Econometric Society, vol. 41(5), pages 867-87, September.
- Kent Daniel & David Hirshleifer & Avanidhar Subrahmanyam, 1998. "Investor Psychology and Security Market Under- and Overreactions," Journal of Finance, American Finance Association, vol. 53(6), pages 1839-1885, December.
- Summers, Lawrence H, 1986. " Does the Stock Market Rationally Reflect Fundamental Values?," Journal of Finance, American Finance Association, vol. 41(3), pages 591-601, July.
- Detemple, Jerome B, 1986. " Asset Pricing in a Production Economy with Incomplete Information," Journal of Finance, American Finance Association, vol. 41(2), pages 383-91, June.
- Shiller, Robert J, 1981.
"Do Stock Prices Move Too Much to be Justified by Subsequent Changes in Dividends?,"
American Economic Review,
American Economic Association, vol. 71(3), pages 421-36, June.
- Robert J. Shiller, 1980. "Do Stock Prices Move Too Much to be Justified by Subsequent Changes in Dividends?," NBER Working Papers 0456, National Bureau of Economic Research, Inc.
- Allen F. & Morris S. & Postlewaite A., 1993. "Finite Bubbles with Short Sale Constraints and Asymmetric Information," Journal of Economic Theory, Elsevier, vol. 61(2), pages 206-229, December.
- Allen, Franklin & Gale, Douglas, 2000. "Bubbles and Crises," Economic Journal, Royal Economic Society, vol. 110(460), pages 236-55, January.
- Gennotte, Gerard, 1986. " Optimal Portfolio Choice under Incomplete Information," Journal of Finance, American Finance Association, vol. 41(3), pages 733-46, July.
- Allen, Franklin & Gale, Douglas, 1992. "Stock-Price Manipulation," Review of Financial Studies, Society for Financial Studies, vol. 5(3), pages 503-29.
- Kurz, Mordecai, 1994. "On Rational Belief Equilibria," Economic Theory, Springer, vol. 4(6), pages 859-76, October.
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