Paul Krugman noted a strange alliance between celebrity and the stock market last week.

From the FT: stock in Berkshire Hathaway, Warren Buffet’s company, jumps every time Anne Hathaway, the actress, gets a lot of media play.

Why? The claim is that it’s the fault of robotrading algorithms, which now account for most of the market, and which sometimes rely among other things on trends in news coverage.

That’s the kind of dumb mistake human traders wouldn’t make. Unfortunately, they’d make other kinds of dumb mistakes.

So, for all of you out there lucky enough to be able to afford a share of Berkshire Hathaway, this one’s for you.