The Null Device

The Hathaway Effect

The Hathaway Effect: an observation that when Hollywood celebrity Anne Hathaway makes headlines, stock in Berkshire Hathaway, Warren Buffett's company, rises, for no other reason. Is it a demonstration of human irrationality (significant numbers of investors getting a good feeling about a stock by virtue of having its name in their mind for an unconnected reason), or, as the article suggests, automated trading systems picking up entertainment headlines and buying stock on the basis of them?

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