The NFL is so successful because it is perfectly suited for television
The predictable weekly cadence of football games ritualizes the experience of watching together, and their relative scarcity makes every game meaningful. With the stop-and-go play of the sport, there are predictable, repeating stoppages to allow broadcasters to sell lots of advertising inventory. The league sits in the sweet spot compared to MLB (many games) and NBA and soccer (continuous play with fewer ads). This Acquired episode distills fascinating insights into the NFL's business and history.

