Just more than a week ago, the NFC’s New York Giants defeated the AFC’s New England Patriots in the 46th edition of the Super Bowl and that should have all investors cheering, even those from Boston. That’s because according to the Super Bowl Indicator, a win by a team from the old NFL (now the NFC) portends a positive year in the stock markets while a win by a team from the old AFL (now the AFC) foreshadows a fall.
Sound crazy? Well, it has been right more than 80% of the time, including each of the last three years and has a higher accuracy than many market prognosticators. There are many other statistical indicators that investors follow too: the January Effect , “Sell in May and go away” , Santa Claus Rally , presidential term cycles and the hemline indicator to name a few.
Why do investors gravitate to these types of indicators to give them direction for the coming year? Behavioral finance uses terms like “Representativeness Heuristics” and “Clustering Illusions,” but what they are getting at is that the human mind is a pattern-seeking device, preferring order over randomness. While this helps the brain organize and quickly process large amounts of data, it is a mental shortcut that can be detrimental in investing. We allow ourselves to get correlation confused with causation. Any back-tested investment strategy which has mined data to find a pattern runs the same risk.
Which leads me to another thought on why investors do it: it’s easy. It’s a lot easier to invest based on some technical or statistical indicator than it is to have a disciplined investment strategy, doing hard and time consuming work of understanding companies and their financials and assessing their attractiveness relative to current stock price. It’s a lot easier to have confidence in a strategy you know has worked in the past even though there is no reasonable rationale it will continue to work in the future.
Returning to the Super Bowl Indicator, it is interesting to note that when it was first proposed back in 1978, it had a 100% success rate (11 out of 11). By 1998, the success rate was still greater than 90% and now had 30 years of history to tout its predictive power. Since then, the success rate has been barely above 50%, missing 1998 and 1999’s spectacular rally (Broncos win) and taking the brunt of the 2008 bear market (Giants win). Even other indicators with some underlying justification like the January Effect have lost some of their luster over the last 15 years.
All that being said, I’m feeling pretty bullish for 2012: Who needs to worry about Europe’s financial crisis, the US debt and deficit, and Middle East stability when it was one of the best January’s ever, it’s the fourth year of a presidential term, and the Giants won the Super Bowl.



