Hidden Economics

The Flywheel and What Separates a Real Loop From a Diagram

A four-part test that tells you whether the loop on your strategy slide is a machine that compounds or a picture of things you would like to be true — and what to do about each arrow that fails.

  • Intermediate
  • 13 min total
  • 14 chapters

What decision this helps you make: Whether to keep investing in a loop you have drawn, which single arrow to strengthen first, and when to admit that what you have is a funnel with the ends joined up.

What this topic is

A flywheel is a chain of causes arranged so that the last one feeds back into the first, and each full turn leaves the next turn cheaper, faster or larger. That is the whole definition, and it has teeth: every arrow has to be a real mechanism, the loop has to close, and one turn has to produce more than one turn's worth of input. Most loops drawn on slides fail at least one of those tests, which is why the diagram exists and the compounding does not.

Why it matters

A genuine loop is the only structure in business that gets stronger the longer you leave it running, and it is the reason a small early lead can become an unbridgeable one. A drawn loop with a broken arrow, by contrast, absorbs investment indefinitely and returns linear results, while everyone involved believes the compounding is about to start. Telling the two apart is worth more than any individual growth tactic.

Who should learn it

Founders and operators who have drawn a loop and want to know if it is real, anyone evaluating a company whose whole story is a virtuous cycle, and anyone who has watched a strategy deck full of circular arrows and been unable to say why it felt hollow.

What you will understand

  • The four tests a loop must pass: a named mechanism per arrow, closure, gain above one, and a cycle time you can measure
  • How to compute the loop gain of your own model from numbers you already have
  • Why every reinforcing loop eventually meets a limiting one, and how to find yours before it finds you
  • How the same structure runs backwards, and what that looks like from inside the company

Prerequisites

Common misconception

"We have a flywheel — better product brings more customers, more customers bring more revenue, more revenue funds a better product." That is a description of a functioning business, not a loop, and the tell is that every arrow is true of every company that has ever worked. A loop only compounds if the return trip is disproportionate: the revenue from this turn must buy more product improvement than the last turn did, or attract customers more cheaply than the last turn did. Without that, you have drawn a circle around ordinary reinvestment, and reinvestment is linear. The question is never whether the arrows are true. It is whether they are steep.