Never underestimate the power of a great flywheel, especially when it builds compounding momentum over a very long time. Once you get your flywheel right, you want to renew and extend that flywheel for years to decades—decision upon decision, action upon action, turn by turn—each loop adding to the cumulative effect. But to best accomplish this, you need to understand how your specific flywheel turns. Your flywheel will almost certainly not be identical to Amazon’s, but it should be just as clear and its logic equally sound.