The Two-Criteria Flywheel Test
Add businesses that exploit an existing advantage and strengthen the original engine.
- Difficulty
- Advanced
- Time to result
- ~ongoing to results
- Steps
- 4
- Confidence
- 98%
The Two-Criteria Flywheel Test evaluates a new business line through two linked questions. First, does an existing asset—such as intellectual property, customers, data, distribution, trust, or operational capability—give the company an unfair advantage in launching the new activity? Second, does the new activity feed value back into the original business? Passing only the first test creates a useful adjacency but not a complete flywheel. Passing both creates a reinforcing loop in which growth in one component accelerates another and returns additional momentum to the starting point. The model helps leaders articulate causal links, reject superficial synergy claims, and choose expansions that compound existing strengths rather than dilute them.
Origin
Ben Gilbert articulated the two criteria while reviewing the flywheel theme on Acquired.
Core principles
- 01An existing asset should create an unfair starting advantage.
- 02The new activity must reinforce the original business.
- 03Momentum should circulate rather than terminate.
- 04Each component should improve another component's economics or demand.
- 05Adjacency without feedback is diversification, not a flywheel.
How to run it
- 1
Inventory the Core Assets
List the customers, data, intellectual property, capabilities, trust, and distribution the existing business uniquely controls. Identify assets that are difficult for a new entrant to reproduce.
Pro tip Include behavioral access and customer intent, not just tangible assets.
Watch out A familiar brand is not automatically an unfair advantage in every adjacent market.
- 2
Test the Launch Advantage
Ask whether those assets materially lower the cost, risk, or time required to launch the proposed business. Compare the company with a cold-start entrant.
Pro tip Quantify advantages such as acquisition cost, conversion rate, or content availability.
Watch out Shared overhead alone is usually too weak to establish a flywheel.
- 3
Trace the Return Path
Explain exactly how success in the new business increases demand, quality, economics, or defensibility in the original business.
Pro tip Draw the loop with directional arrows and label the value transferred at each link.
Watch out If the causal path ends at the new business, the loop is incomplete.
- 4
Measure Both Directions
Select metrics for the core-to-adjacency boost and the adjacency-to-core return. Continue investing only if both effects become observable.
Pro tip Run a bounded pilot before committing the full organization.
Watch out Revenue growth in the adjacency does not prove that the original business is strengthening.
In the wild
Disney's film characters and stories give it an unfair advantage when launching merchandise and theme-park attractions. Those products keep the characters culturally visible and encourage consumers to watch more Disney content and visit its parks.
→ Each business line sustains demand for the others and extends the economic life of Disney's intellectual property.
Airbnb can introduce experiences to travelers who already visit the platform to book lodging. If experiences later attract customers in their own right, Airbnb can direct those users back toward accommodation bookings.
→ Lodging demand bootstraps experiences, while experiences can generate additional lodging demand.
Common mistakes
Claiming One-Way Synergy
An existing advantage may help launch an adjacency, but without a return path it does not form a flywheel.
Drawing Unsupported Arrows
A diagram is not evidence; every connection must represent a plausible and measurable transfer of value.
Is it for you?
Best for
It is best for companies considering new products, services, channels, or monetization layers.
Not ideal for
It is not ideal for deliberately diversified portfolios whose businesses are expected to remain independent.
From the transcript
“criteria two is does the existence of that new thing that you do feedback and grow your your original business?”
From the episode
Special: 2016 Review and 2017 Predictions