Flywheel(Flywheel)

A model that recasts customer growth as a momentum-storing wheel: each acquired customer reduces friction and speeds the next acquisition. The metaphor traces back to Jim Collins’s Good to Great and was popularized for marketing by HubSpot.

Where a funnel consumes prospects linearly, a flywheel cycles through Attract → Engage → Delight, with satisfied customers fueling word-of-mouth, reviews, and referrals. NPS and referral rate are typical core metrics.