| url | https://pmarchive.com/guide_to_startups_part4.html |
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| raw | raw/pmarca-only-thing-that-matters.txt |
Marc Andreessen’s foundational essay on product-market-fit. This is where the term was crystallized and given its canonical definition.
The argument
Every startup has three core elements: team, product, and market. Of the three, market matters most. In a great market — one with lots of real potential customers — the market pulls product out of the startup. In a terrible market, the best product and the best team still fail.
Andreessen credits Andy Rachleff with the formulation (Rachleff’s Law):
When a great team meets a lousy market, market wins. When a lousy team meets a great market, market wins. When a great team meets a great market, something special happens.
From this follows Rachleff’s Corollary: the only thing that matters is getting to product/market fit.
The definition
Product/market fit means being in a good market with a product that can satisfy that market.
You can feel when it isn’t happening: customers aren’t getting value, word of mouth isn’t spreading, usage isn’t growing, press reviews are lukewarm, deals don’t close. You can also feel when it is happening: customers are buying as fast as you can make it, money is piling up, you’re hiring as fast as you can, reporters are calling.
Key claims
- Market > team > product. A great market will tend to equal success. Neither a stellar team nor a fantastic product will redeem a bad market.
- BPMF vs APMF. A startup’s life divides into Before Product/Market Fit and After. When BPMF, focus obsessively on getting there — do whatever is required, including changing people, rewriting the product, or moving to a different market.
- Great products can create markets (VMware), but this is the best-case scenario — don’t count on it.
- Causation is misattributed. Successful founders cite all kinds of things that had nothing to do with their success. In almost every case, the real cause was PMF.
Connections
This essay is the theoretical foundation that superhuman-pmf-engine later operationalized with the Sean Ellis 40% test. Andreessen’s “market pulls product out of the startup” echoes growth-as-compass — when PMF is real, growth is organic and unmistakable. The emphasis on market size connects to invisible-asymptotes (growth ceilings), gumroad-failure (PMF in too-small a market), and Thiel’s monopoly-vs-competition (start small, but the market must be big enough to matter).