The first year after it was introduced, not many three-pointers were attempted. But by last season, more than one out of every three shots attempted in NBA games was a three-pointer. We bring you the story of the three-point shot's takeover of basketball, the economic lessons of how it changed the game, and why it is now having unintended effects that could be a problem for basketball's future. A bonus episode of NPR's The Indicator from Planet Money.