A Model of Two Days: Discrete News and Asset Prices
89 Pages Posted: 30 Sep 2017 Last revised: 20 Mar 2021
Date Written: March 19, 2021
Empirical studies demonstrate striking patterns in stock market returns in relation to scheduled macroeconomic announcements. First, a large proportion of the total equity premium is realized on days with macroeconomic announcements, despite the small number of such days. Second, the relation between market betas and expected returns is far stronger on announcement days as compared with non-announcement days. Finally, these results hold for fixed-income investments as well as for stocks. We present a model with rare events that jointly explains these phenomena. In our model, which is solved in closed form, agents learn about a latent disaster probability from scheduled announcements. We quantitatively account for the empirical findings, along with other facts about the market portfolio.
Keywords: rare disasters, regime shifts, learning
JEL Classification: G11, G12
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