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.

April 22, 2026 • The global oil market has supported the U.S. dollar for more than 50 years. But the system has shown signs of cracking. Amidst the Iran war, Iran has reportedly been collecting some ...