Score 1 for the Bulls

Sports Illustrated swimsuit issue is an indicator pointing toward an up market.

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Even as empirical economic data move in the wrong direction for investors, Wall Street's superstition-based indicators continue their upbeat trend.

Just 10 days ago, the New York Giants' upset victory over the New England Patriots pointed the Super Bowl indicator in a bullish direction. And now, investors can take comfort in positive news from the lesser-known Sports Illustrated swimsuit issue indicator as well.

Turns out that when an American model appears on the front cover of the swimsuit issue, the stock market does nearly twice as well as when a foreign model does. Bespoke Investment Group recently tackled the issue:

"Over the last 30 years, an American has appeared on the cover of the annual Sports Illustrated Swimsuit Issue in 15 different years. The average performance of the S&P 500 during those 15 years is a gain of 13.9% with 13 positive years (87%). Of the fifteen years where no American appeared on the cover, the S&P 500 has averaged a gain of only 7.2% with 11 positive years (73%)."

You can check out the data here.

But markets aside, researchers remained baffled by the puzzling spike in male consumption of literature that often accompanies the swimsuit issue's release.