Open AccessRecalcitrant betas: Intraday variation in the cross‐sectional dispersion of systematic risk
Author(s) -
Andersen Torben G.,
Thyrsgaard Martin,
Todorov Viktor
Publication year - 2021
Publication title -
quantitative economics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.062
H-Index - 27
eISSN - 1759-7331
pISSN - 1759-7323
DOI - 10.3982/qe1570
Subject(s) - dispersion (optics) , econometrics , economics , panel data , distribution (mathematics) , earnings , systematic risk , mathematics , physics , finance , mathematical analysis , optics
We study the temporal behavior of the cross‐sectional distribution of assets' market exposure, or betas, using a large panel of high‐frequency returns. The asymptotic setup has the sampling frequency of returns increasing to infinity, while the time span of the data remains fixed, and the cross‐sectional dimension of the panel is either fixed or increasing. We derive functional limit results for the cross‐sectional distribution of betas evolving over time. We demonstrate, for constituents of the S&P 500 market index, that the dispersion in betas is elevated at the market open and gradually declines over the trading day. This intraday pattern varies significantly over time and reacts to information shocks such as clustered earning announcements and releases of macroeconomic news. We find that earnings news increase beta dispersion while FOMC announcements have the opposite effect on market betas.