A round now needs two burn lines, not one

The old assumption behind a seed round was simple. It bought eighteen months of runway, and runway meant payroll, enough people to reach product-market fit before the money ran out. Burn was one number, and it stayed roughly fixed until the company hired again.

I keep seeing smaller teams building bigger things than that math would have predicted, two or three people now shipping and iterating on what used to need a team of ten. That alone would just mean smaller rounds buy the same runway. It doesn't stop there.

Payroll shrinking is only half of what changed. The half nobody's pricing into the round yet is inference. Every one of these smaller teams is running on a model, and that spend doesn't behave like payroll. Payroll is fixed until the company hires again. Token spend scales with usage, so it grows exactly when the product starts working, which is the one moment nobody wants to discover their burn model was wrong.

A round modeled on one flat number for eighteen months misprices exactly the moment that matters. It needs two lines instead, one that's shrinking, headcount, and one that grows with traction, inference, and collapsing them into a single burn figure hides the one that's about to move.

The check should get smaller for the same milestone, that part is real. But the day a team finally hits product-market fit is the day the second number starts outweighing the first, and a fund still underwriting last decade's cost structure against this decade's product is going to misprice the round in exactly the direction that hurts.