The NFL has emphasized fining players who have unsportmanlike penalties, or conduct they view as detrimental to the game, through two weeks. Think of antics from players like George Pickens last year, ...

Twenty years after the introduction of the theory, we revisit what it does—and doesn’t—explain. by Clayton M. Christensen, Michael E. Raynor and Rory McDonald Please enjoy this HBR Classic. Clayton M.