Constraint-First Growth Diagnosis
Identify the binding growth constraint before choosing tactics
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 6
- Confidence
- 98%
Constraint-First Growth Diagnosis starts by modeling what must be true for a business to grow, then identifying the scarcest required input. In a two-sided marketplace, the analysis explicitly separates supplier availability from buyer demand because either side can limit transactions. In an established product-led company, adoption and customer satisfaction provide evidence about whether the product is adequate, shifting attention toward economical distribution. The output is not a broad marketing plan but a clear statement of the binding constraint and a short list of interventions tied directly to it. Teams then judge each intervention by whether it increases the constrained input without damaging marketplace quality or unit economics.
Origin
Extracted from Marketing Against The Grain during the hosts' diagnosis of Lemon.io and Bonjoro before proposing growth ideas.
Core principles
- 01Growth tactics should address the current binding constraint.
- 02Two-sided marketplaces must diagnose supply and demand separately.
- 03Existing adoption can indicate that distribution, not product, is limiting growth.
- 04Customer acquisition must remain compatible with unit economics.
How to run it
- 1
Model the Growth System
List the inputs the business needs to grow, such as suppliers, buyers, product activation, retention, and affordable acquisition.
Pro tip Describe each input in measurable terms rather than using broad labels like marketing or product.
- 2
Find the Scarce Input
Determine which required input is failing to keep pace with the others and therefore limiting total growth.
Watch out Do not assume the most visible problem is the binding constraint.
- 3
Split Marketplace Sides
For a marketplace, assess supplier capacity and customer demand independently, including quality and matching efficiency.
Pro tip Examine whether adding demand would overwhelm supply or whether more supply would sit idle.
- 4
Test the Product Constraint
Use adoption, retention, satisfaction, and demonstrated product-market fit to judge whether product weakness remains the primary barrier.
Watch out A large user count alone does not prove strong retention or monetization.
- 5
Test the Distribution Constraint
Assess whether the company can acquire enough qualified customers at a cost that preserves viable economics.
Pro tip Compare acquisition cost with contribution margin and realistic lifetime value.
- 6
Target the Bottleneck
Prioritize tactics according to how directly and efficiently they relieve the diagnosed constraint.
Pro tip State the causal link between each tactic and the constrained input.
Watch out Avoid spreading resources evenly across unconstrained areas.
In the wild
A developer marketplace has interested startups but too few qualified specialists in several programming languages. The team identifies supply quality as the binding constraint and reallocates budget from broad buyer advertising to developer recruitment, portfolio tools, and temporary supplier incentives.
→ Match availability improves before the company resumes aggressive demand acquisition.
A low-priced video product already serves tens of thousands of companies and offers free onboarding. The team treats this as evidence of product-market fit, investigates acquisition economics, and identifies insufficient economical reach as the main constraint.
→ The growth plan shifts toward channel-native distribution rather than an unnecessary product overhaul.
Common mistakes
Starting With Favorite Tactics
Teams often choose channels or campaigns they enjoy before establishing which business input is actually constrained.
Treating Both Marketplace Sides Alike
A marketplace can waste money by stimulating buyers and suppliers equally when only one side is scarce.
Ignoring Acquisition Economics
More customers do not create healthy growth if acquiring them destroys the business's margins.
Is it for you?
Best for
It is best for established startups, marketplaces, and product-led businesses deciding where to concentrate limited resources.
Not ideal for
It is not ideal when a company lacks enough customer or operating evidence to identify a meaningful constraint.
From the transcript
“So I think first of all, you need to know if you are supplier demand constrained.”
“And I think we have to look at them and say, what is their constraint for growth?”
“And for everybody listening, when we say distribution constrained, what we mean is their biggest barrier to growth is their ability to acquire new customers…”
From the episode
Turn Your Solid Business into Big Business (Half-Baked Marketing Ideas)