The usual launch builds the product, shoots the ads, spends on acquisition and emails the list on launch day with everyone else. It pays to acquire strangers into a product your own customers could have judged for free.

What the base tells you, and what it doesn’t

Vanitha Swaminathan, Richard Fox and Srinivas Reddy followed six real brand extensions through a national household scanner panel. Experience with the parent brand had a significant effect on whether households tried the extension, and not on whether they bought it again Published. Your customers will try the new thing because they like you. They’ll buy it a second time only if the product earns it.

That’s the case for launching to the base first, and the warning attached to it. The base gives you trial cheaply and quickly. It also inflates first-order numbers with goodwill. So read a base launch on repeat: the share of first buyers who buy the new category again within about one and a half times its natural reorder interval. Timing the reorder itself is covered in The Second Order.

Trial measures how much they like you. Repeat measures how much they like the product.

A next category grows slowly

Warby Parker sells glasses first. It launched Scout daily contact lenses in 2019. Five years later, in 2024, contacts were 10.2% of its $771.3 million in net revenue, and eye exams and vision care another 5.3% Filed. That’s one step out on the four shared things (the same customers, the same need to see well, and the same optical proof) and it still took years to reach a tenth of revenue. Plan the next category’s first year as a test, not a second engine.

The sequence

1. Fit surveyThe three questions from chapter 5, before any samples are ordered.
2. WaitlistEmail active customers, and text those who agreed to marketing texts, with a short description and a waitlist button. No discount. Record sign-ups by segment.
3. First run, sized to the waitlistStock for the waitlist’s likely buyers, not the launch plan. Early access at full price.
4. Read repeatAt one and a half times the reorder interval: how many first buyers reordered, and their contribution after returns.
5. Then open it upSpend on acquisition only when repeat clears the bar in the launch brief.

Say the coffee brand from chapter 4 emails its 20,000 active customers about cold-brew concentrate, and 1,600 join the waitlist, 8% of the base. If 40% of the waitlist buys in the first month, that’s 640 buyers, 3.2% of the base, against the 14% it needs in year one to earn back the launch cost Derived. More customers will buy over the year, so the gap isn’t fatal, but it says: small first run, then wait for the repeat rate.

Do this

• Write the repeat bar into the launch brief before the waitlist opens: what share of first buyers must reorder, by what date, for the category to get acquisition spend. The brief is in Appendix B.
• Send the waitlist email for your top candidate. Use the sign-up rate, by segment, to size the first order.