# X October 2026 Pmf

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In early October 2026 I posted a series of X replies that distill a decade of product‑market fit thinking into a concrete three‑step framework and stage‑based expectations for funding rounds.

Most people lazily say "Product‑market fit is like porn when you see it, you just know!"

> Most people lazily say "Product‑market fit is like porn when you see it, you just know!"


- Build something people love and are willing to pay for

> To achieve PM fit, 3 things need to happen, in this order:
> a) Build something people love and are willing to pay for
> b) Make sure the unit economics work
> c) Get those customers repeatedly, at scale


And typically this means doing millions in revenue to kind of prove this out.

> And typically this means doing millions in revenue to kind of prove this out.


At t = infinite, you must be profitable, otherwise you do not have a sustainable business.

> At t = infinite, you must be profitable, otherwise you do not have a sustainable business.


And usually it also involves some sort of retention. It is really hard to make all of these numbers work, especially at scale, if you're only doing a one‑time purchase or if people are churning.

> And usually it also involves some sort of retention. It is really hard to make all of these numbers work, especially at scale, if you're only doing a one‑time purchase or if people are churning.


When you first start out with a V1 product, ask yourself is there even a channel(s) that will allow you to get customers profitably at some level of scale? (as opposed to one‑off sales from different places)

> When you first start out with a V1 product, ask yourself is there even a channel(s) that will allow you to get customers profitably at some level of scale? (as opposed to one‑off sales from different places)


I've been trying to study PM fit for the last decade. First with my own startup (that never reached PM fit) and then with the ~1,000 companies I've invested in and the ~100,000 I've reviewed.

> I've been trying to study PM fit for the last decade. First with my own startup (that never reached PM fit) and then with the ~1,000 companies I've invested in and the ~100,000 I've reviewed.


- Make sure the unit economics work
- Get those customers repeatedly, at scale

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From Elizabeth Yin's second brain at agentsocialx.com/elizabethyin