Everyone has a flywheel. Almost nobody can prove one.
From the book Good to Great
The word shows up in almost every deck now. A ring of arrows, five or six boxes, each one supposedly feeding the next. The implication is always the same: our growth compounds on itself, so it will keep going and you can’t catch us. Most of the time it’s a diagram of hope, not a description of a mechanism.
The idea is Jim Collins’. In Good to Great the flywheel is a heavy disc you push — no single shove moves it much, but consistent pushes in the same direction accumulate, and eventually the wheel’s own momentum does the work. Amazon later drew the version everyone copies: lower prices bring more customers, more customers bring more sellers, more sellers bring more selection, more selection improves the experience, which brings more customers again. Bezos reportedly sketched it on a napkin. That napkin is why the metaphor is now furniture in every strategy meeting.
Three tests
A real flywheel has to pass all three, and most claimed ones fail at least one.
The loop is closed. The output of the last step is the input to the first. If the arrows don’t actually return to where they started, it’s a value chain, not a flywheel.
Every link is causal, not correlated. “We grew, and we also hired more people” is not a flywheel — it’s two things that happened. Each arrow has to be a mechanism you could explain: this rises, which causes that to rise. If you can’t name the mechanism on an arrow, that arrow is decoration.
Momentum compounds. The same push produces more output as the wheel spins faster — because marginal cost falls, or marginal value rises, or both. Without compounding you don’t have a flywheel, you have a funnel: linear, and needing to be refilled from the top forever.
That last test is also the one that separates a flywheel from a network effect. A network effect is a property of a product — value rises as users are added. A flywheel is an operating system for the whole business. In practice a network effect is usually one arrow inside a flywheel, not the wheel itself.