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Dynamic distortions of the security market line: Evidence from asymmetric volatility and regime-switching models

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  • Brik, Hatem

Abstract

This study re-examines the empirical validity of the Capital Asset Pricing Model (CAPM) by asking whether the Security Market Line (SML) remains stable when markets experience asymmetric volatility and regime transitions. Using high-frequency data from 2015 to 2024 for four major U.S. large-cap firms, we implement a unified empirical framework that integrates quantile regression, rolling-window CAPM estimation, and a two-state Markov-Switching AR(1) model.

Suggested Citation

  • Brik, Hatem, 2026. "Dynamic distortions of the security market line: Evidence from asymmetric volatility and regime-switching models," The North American Journal of Economics and Finance, Elsevier, vol. 82(C).
    • Handle: RePEc:eee:ecofin:v:82:y:2026:i:c:s1062940825002062
    DOI: 10.1016/j.najef.2025.102566
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    Keywords

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    JEL classification:

    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • C58 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Financial Econometrics
    • C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes

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