Cold Start

Search for marketplace cold-start advice and you’ll be handed thresholds. Seed 200 listings. Hand-match 100 pairs. Flip the network at 500 transactions. The numbers are specific, which reads as rigor, and they’re almost always traceable to nothing.

I checked one all the way down.

A widely shared 2026 guide claims 67% of failed marketplaces die on the supply side, and credits a16z. a16z’s own published material says close to the opposite. The same guide’s sample size changed from nine to eleven inside a single page.

That’s the median artifact in this category, not an unusually bad one. So Cold Start doesn’t hand you thresholds. It hands you procedures.

Six steps, each with a gate

Every step ends somewhere you either pass or you don’t. No vibes, no “you’ll know it when you see it.”

• 0 — Find the hard side. It isn’t the scarce side, and getting this one wrong quietly costs you the next six months.
• 1 — Define your cell. The smallest unit where liquidity is actually achievable, instead of the market you wish you were in.
• 2 — Derive your own supply number from two constraints: capacity and coverage. Most founders calculate one and never learn the other exists. That model is mine, and the book says so.
• 3 — Earn the hard side with a tool that works before the network does.
• 4 — Match by hand, and measure the leak you’re creating while you do it.
• 5 — Seed supply without lying. There’s a popular 2026 tactic here that will get you sued. The chapter is precise about where the line sits.
• 6 — Know when it flipped, using the indicator that moves first.

Plus two checks that aren’t steps: what the demand side actually needs, and whether the cell you made liquid is even attached to a business.

Every number is marked

You should never have to guess where a figure came from, so each one carries its provenance in the text.

• Derived — you calculate it from your own market.
• Sourced — it traces to a citation on the last page.
• Judgment — mine, unsourced, marked J so you can discount it.

There are twelve J markers. I’d rather you see all twelve than trust an unmarked one. The Step 2 model even comes with its own warning label: which assumption is most likely to be false in your market, and how to correct for it.

What’s in the bundle

• EPUB — for reading.
• PDF — the worksheets and the 14-week sheet, the parts you print and write on.
• Audio — roughly fifty minutes.

7,542 words. about forty minutes to read. one quarter to run.

Who this isn’t for

Anyone who needs a number to put in a deck by this afternoon. Every figure in here asks you to go measure something first, and a few of them will tell you things about your cell you’d rather not know. If you want a threshold to borrow, the internet is full of them. This is the other thing.