Article · 12 min read

Product-Market Fit is a Broken Concept. There's a Better Way.

Rand Fishkin · SparkToro Free Intermediate

Fishkin pushes back on the fuzzy way founders talk about fit and argues for tracking concrete behaviors like usage, retention, and referrals instead. It pairs well with your question because it insists the truth is in what people do repeatedly, not in a moment of sign-up. A healthy contrarian read to keep you honest.

  • Judge demand by repeated behavior over time, not a single signup event
  • Referrals and organic return visits are stronger signals than stated interest
  • Vague 'do we have fit' debates dissolve when you watch real usage data
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The question it answers

  1. My first 5 customers were friends who signed up to be nice. How do I know if any of them actually want the product?

Read with it

  1. The single best thing ever written on customer conversations. It teaches you to ask about the customer's life and past... momtestbook.com Book · ~130 pages The Mom Test Rob Fitzpatrick
  2. The essay that put 'product-market fit' into the startup vocabulary. Read it for the gut-level description of what PMF feels... pmarchive.com Essay · ~15 min read The Only Thing That Matters Marc Andreessen
  3. The nuanced counterweight: PMF isn't a single binary moment, it can be lost, and 'market' is doing more work than founders... a16z.com Article · ~20 min read 12 Things About Product-Market Fit Andreessen Horowitz (a16z)
  4. The permission slip to recruit users by hand, do things manually, and deliver 'insanely great' experiences to your first few... paulgraham.com Essay · ~15 min read Do Things That Don't Scale Paul Graham
  5. The foundational text of customer development, 'get out of the building' started here and became the backbone of the Lean... steveblank.com Book · ~370 pages The Four Steps to the Epiphany: Successful Strategies for Products that Win Steve Blank
  6. Video · ~25 min How to Talk to Users Eric Migicovsky
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