The National Football League playoffs produced a Super Bowl matchup that suggests a winning year for stocks is now a lock.

When the Pittsburgh Steelers upset the Denver Broncos Sunday, it meant that neither team in the Feb. 5 game will have American Football League roots. The Steelers, which moved to the American Football Conference when the NFL and AFL merged in 1970, will face the Seattle Seahawks in this year’s championship game.

And according to the Super Bowl Stock Indicator, a victory by an old NFL team means a bullish year for stocks, while a victory by an old AFL team gives the bears the upper hands.