Modelling Asset Prices with Time-Varying Betas
AbstractThis paper pursues the idea that the relevant distributional moments for the Capital Asset Pricing Model (CAPM) are the conditional, rather than the unconditional, covariances of returns. Thus, asset Betas may be time-varying and random rather than constant. The model is parameterized and estimated on monthly U.K. data by an application of the Autoregressive Conditional Heteroscedasticity (ARCH) formulation of Engle and its generalization (GARCH) due to Bollerslev. We also estimate a more general model which nests the consumption-based CAPM of Breeden. The results suggest that perceptions of risk, i.e. conditional variances and covariances, are time-varying but that memories are long and agents update their perceptions relatively slowly. Despite this, measured asset Betas show substantial short-term variation. Estimates of an extended CAPM, nesting both traditional and consumption-based variants, suggest that whilst significant time-variation in risk premia is still evident, no single measure of r Copyright 1989 by Blackwell Publishers Ltd and The Victoria University of Manchester
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Bibliographic InfoArticle provided by University of Manchester in its journal The Manchester School of Economic & Social Studies.
Volume (Year): 57 (1989)
Issue (Month): 4 (December)
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Web page: http://www.socialsciences.manchester.ac.uk/disciplines/economics/
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- Andrew Worthington & Helen Higgs, 2005.
"Market Risk in Demutualised Self-Listed Stock Exchanges: An International Analysis of Selected Time-Varying Betas,"
School of Economics and Finance Discussion Papers and Working Papers Series
201, School of Economics and Finance, Queensland University of Technology.
- Andrew Worthington & Helen Higgs, 2006. "Market Risk in Demutualized Self-Listed Stock Exchanges: An International Analysis of Selected Time-Varying Betas," Global Economic Review, Taylor and Francis Journals, vol. 35(3), pages 239-257.
- J. Andrew Coutts & Terence Mills & Jennifer Roberts, 1997. "Time series and cross-section parameter stability in the market model: the implications for event studies," European Journal of Finance, Taylor and Francis Journals, vol. 3(3), pages 243-259.
- Attiya Y. Javed, 2000. "Alternative Capital Asset Pricing Models: A Review of Theory and Evidence," PIDE-Working Papers 2000:179, Pakistan Institute of Development Economics.
- Choudhry, Taufiq, 2005. "Time-varying beta and the Asian financial crisis: Evidence from Malaysian and Taiwanese firms," Pacific-Basin Finance Journal, Elsevier, vol. 13(1), pages 93-118, January.
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