Rounding and the impact of news: a simple test of market rationality
Certain prominent scheduled macroeconomic news releases contain a rounded number on the first page of the release that is widely cited by newswires and the press and a more precise number in the text of the release. The whole release comes out at once. We propose a simple test of whether markets are paying attention to the rounded or unrounded numbers by studying the high-frequency market reaction to such news announcements. In the case of inflation releases, we find evidence that markets systematically ignore some of the information in the unrounded number. This is most pronounced for core CPI, a prominent release for which the rounding in the headline number is large relative to the information content of the release.
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- Owen A. Lamont & Richard H. Thaler, 2003.
"Can the Market Add and Subtract? Mispricing in Tech Stock Carve-outs,"
Journal of Political Economy,
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- Owen A. Lamont & Richard H. Thaler, 2001. "Can the Market Add and Subtract? Mispricing in Tech Stock Carve-Outs," NBER Working Papers 8302, National Bureau of Economic Research, Inc.
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- Christopher A. Sims, 2006. "Rational Inattention: Beyond the Linear-Quadratic Case," American Economic Review, American Economic Association, vol. 96(2), pages 158-163, May. Full references (including those not matched with items on IDEAS)
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