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Maximum Mispricing on Announcement Days

Research output: Working paper

Publication date31/08/2018
<mark>Original language</mark>English


I study the role of macroeconomic announcements in the multidimensional challenge posed by Cochrane (2011). Recent work argues that market betas explain average returns well on announcement days, however I document that the exposure to a multi-signal factor contributes to explain the cross-section on those days. A long-short strategy exploiting these exposures can improve the market Sharpe ratio by 30% on announcement days. I argue that macroeconomic announcements can exacerbate CAPM-mispricing of certain stocks, and its large economic significance can be illustrated through simple trading rules. A parsimonious rational expectations model with multiple signals about fundamentals can reconcile these results.