The Super Bowl “theory” links U.S. stock market performance to the results of the championship football game, held each January since 1967. It holds that if a team from the original National Football League wins the title, the stock market increases for the rest of the year, and if a team from the old American Football League wins, the stock market goes down.
Economist Paul M. Sommers of Middelbury College in Vermont has analyzed the data for the years from 1967 to 1998. He reports his findings in the May College Mathematics Journal.