Product-Market Fit Testing: Every Product Solves a Problem, and Creates a New One
GAIN vs. NEW PAIN
Whether customers actually adopt a product isn’t decided by its benefit alone, but by the ratio of benefit to new effort.
A new product almost always brings an advantage, the GAIN. Just as reliably, it brings new hurdles, the NEW PAIN, things like an unfamiliar user experience, a new payment method, or integration effort. Whether customers switch isn’t decided by the advantage alone, but by the ratio of GAIN to NEW PAIN.
43% Fail Because of Product-Market Fit
Recent numbers confirm exactly that. A CB Insights analysis from March 2026 looked at the causes behind 431 VC-backed company shutdowns. The finding: for 43%, the real cause was a lack of product-market fit. Running out of capital came only afterward, that was just the symptom.
We make that ratio measurable with the PAIN-GAIN INDEX, before a product ever goes live.
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The Solution: The PAIN-GAIN TEST
The PAIN-GAIN TEST is a standardized method for measuring the net value customers expect from your product. That net value is what product-market fit really comes down to, and it determines how successful your product will be.
The core idea behind the PAIN-GAIN TEST:
Every product creates not just gain, but always some new pain too.
Your product will succeed if the advantages clearly outweigh the disadvantages:
GAIN >> NEW PAIN
The test is grounded in behavioral and decision research. In the Harvard Business Review, John Gourville of Harvard Business School shows the conditions under which innovations actually get adopted.
How to Actually Measure Product-Market Fit
Your product will be successful if its benefits clearly outweigh its drawbacks:
The PAIN-GAIN INDEX (PGI) as a KPI for Product-Market Fit:
The PAIN-GAIN INDEX (PGI) is the ratio of gain to new pain. If the PGI is greater than 3, your product has everything it needs to succeed.
Between 2 and 3, it gets difficult. The product can still succeed if you increase the value proposition or reduce the barriers to use.
Below a PGI of 2, the product will fail.
Which Target Group Sees the Highest Product-Market Fit?
In practice, not every customer sees the same value. So the real question is what share of your target group sees enough value.
Specifically:
- What share of the target group has a PAIN-GAIN INDEX above 3?
- Which product variant has the highest share with a PGI above 3?
- Which target group, or which target market, has the largest share of users with a PGI > 3?
The PAIN-GAIN TEST gives you exactly that information.
A Measurement Tool for Every Phase of the Product Lifecycle
The PAIN-GAIN TEST is a standardized method that works at every stage of the product lifecycle, from concept through launch to feature expansion in the market.
Who Is the PAIN-GAIN TEST For?
- Corporates launching new digital services
- Innovation departments, product owners
- Business owners, product managers, marketing teams
- Start-ups
- Investors, for customer-side due diligence
What You Get
- Clarity on whether your idea has potential
- An assessment of the target groups you can realistically reach
- A comparison of variants: which one will succeed best?
- A comparison of markets: which one holds the most promise?
- Strong USPs for your marketing
- Visibility into where there’s room to optimize
WhitePaper:
Testing Product-Market Fit of Innovations
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You have a product idea or already a concept and want to secure your investment?
Your product is ready to launch, and you’re looking for the best way to reach your target group?
After a successful launch, how can you prioritize which ideas to develop further?
Wherever you are with your innovation, let’s talk. We’ll quickly see how we can best help you.
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