From Feeling to Measure

What You Will Learn

Separating vivid post-hoc symptoms from leading evidence lets founders act before the market has already delivered its verdict.

The Three Faces of PMF

Product-Market Fit is often treated as a single milestone. In reality, it is a spectrum of evidence.

Paul Graham defines it as making something people want. This focuses on the initial spark of desire.

Sam Altman looks for spontaneous advocacy. This happens when users love a product so much they tell others without being asked.

Marc Andreessen describes the final stage: market pull. This is when the market demands the product faster than you can supply it.

The Andreessen Fever Dream

Marc Andreessen provides a vivid picture of late-stage success. He describes a company struggling to keep up with growth.

In this scenario, money piles up in the bank. You hire staff as fast as possible. Reporters call you constantly.

Eventually, investment bankers stake out your house. While these signs are exciting, they are consequences of success, not the cause of it.

Leading vs Lagging Indicators

The bankers at your door are lagging indicators. By the time they arrive, the market has already delivered its verdict.

Leading indicators capture user dependence early. They tell you if the product is indispensable before you scale.

Superhuman could raise money and get press while still in private beta. These signals did not prove they had PMF. They were merely signs of investor interest and founder reputation.

The Trap of False Signals

Do not confuse financing or publicity with product value. These are often misleading signals for founders.

Superhuman spent years in development despite having high interest from the valley. They knew that press reviews and awards do not equal a product that people cannot live without.

To build an evidence-driven system, you must distinguish between company traction and true market fit.

Putting It All Together

A _____ indicator, such as revenue growth or press coverage, confirms market success after it has already happened.

• lagging
• leading

Answer: lagging

Lagging indicators are symptoms or consequences of success (like money and press), whereas leading indicators (like user dependence) help predict success before it's obvious.

To track PMF evidence in order: first identify _____ by making what people want, then monitor _____ as users tell others, and finally manage _____ when demand exceeds supply.

Answer: To track PMF evidence in order: first identify desire by making what people want, then monitor advocacy as users tell others, and finally manage market pull when demand exceeds supply.

The PMF spectrum moves from the initial spark (Graham), to word-of-mouth (Altman), to explosive demand (Andreessen).

Why did Superhuman ignore high investor interest and press reviews to stay in private beta?

• They were waiting for investment bankers to stake out the founder's house.
• They knew these signals were lagging indicators that didn't prove user dependence.
• They wanted to maximize the amount of money they could raise later.
• They were following Marc Andreessen's rule to avoid all publicity.

Answer: They knew these signals were lagging indicators that didn't prove user dependence.

Fundraising and press are 'lagging' signals of interest or reputation, not 'leading' evidence that the product is indispensable to users.