Question 1

What is product-market fit?

Accepted Answer

The degree to which a product satisfies strong market demand, the state of being in a good market with a product that genuinely satisfies it, where customers want it badly enough that growth becomes self-sustaining.

Question 2

Who coined the term product-market fit?

Accepted Answer

The thinking is credited to Don Valentine, the term was named by Andy Rachleff, and it was popularized by Marc Andreessen in a widely cited 2007 essay.

Question 3

How did Marc Andreessen define product-market fit?

Accepted Answer

As "being in a good market with a product that can satisfy that market." He also argued that before you have it, nothing else matters.

Question 4

What is the 40 percent test?

Accepted Answer

Sean Ellis’s survey: ask users "how would you feel if you could no longer use this product?" If at least 40 percent answer "very disappointed," you likely have product-market fit.

Question 5

Why does the "very disappointed" question work so well?

Accepted Answer

Because its negative framing strips out politeness bias. Only users who genuinely depend on the product feel the sting of imagining it gone, so the answer reflects real need, not flattery.

Question 6

What is the most reliable measure of product-market fit?

Accepted Answer

A retention curve that flattens rather than declining to zero, since it reflects real behavior over time and proves a durable core of users keeps returning.

Question 7

How many responses do you need for the survey?

Accepted Answer

You start getting directionally useful results at around 40 responses, though 100 or more is better and reduces the effect of outliers.

Question 8

Can you improve your product-market fit score?

Accepted Answer

Yes. Rahul Vohra of Superhuman segmented the survey to focus on the users who loved the product and studied the on-the-fence group to convert them, deliberately raising the score.

Question 9

Does growth come before or after product-market fit?

Accepted Answer

After. Spending on growth before fit largely wastes money by acquiring users who do not stick. Growth follows fit, not the other way around.

Question 10

Can product-market fit be lost?

Accepted Answer

Yes. Markets and competitors shift, so fit is not permanent. It should be monitored over time rather than declared once and forgotten.

What Is Product-Market Fit and How to Measure It?

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Q1: What is product-market fit?

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