The Super Bowl Indicator Theory suggests that the stock market will have a positive year if the team in the National Football Conference, or a team with an NFC origin, wins. If the American Football Conference team wins, the market will fall. According to the recent news (MarketWatch, 2/6/2017), it has accurately predicted the direction of the market for the year following 40 of the 50 Super Bowls since the first super bowl in 1967. Why do we have such phenomena? Is the finding consistent with market efficiency? Please explain...I may have further questions..