year, so baseball is the runaway leader in ticket sales. The 32-team National Football League (NFL) is the most popular and only major professional American football league. Its championship game, the Super Bowl, is watched by nearly half of US television households. Additional millions also watch college football throughout the autumn months. Among the sport's all time greatest players are Jerry Rice, Joe Montana, John Elway, Barry Sanders, Walter Payton, Brett Favre, and Emmett Smith. 11. Economy The United States has a capitalist mixed economy which is fueled by abundant natural resources, well-developed infrastructure, and high productivity. According to the International Monetary Fund, the United States GDP of more than $13 trillion constitutes 20% of the gross world product. The largest national GDP in the world, it was slightly larger than the combined GDP of the European Union at purchasing power parity in 2006
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