Draw your growth the way you'd explain it to a new hire. Most DTC brands draw a funnel: ad spend at the top, visits, carts, a sale at the bottom. Then the diagram stops. The customer has paid, the attribution window closes, and next month the team buys another batch of strangers.

A loop is a different drawing. The sale is the middle, not the end. Something the customer does after buying puts the product in front of someone else, and that person's purchase starts the same turn again.

Brian Balfour, Casey Winters, Kevin Kwok and Andrew Chen gave the idea its current name in a 2018 Reforge essay, "Growth Loops are the New Funnels." Eric Ries had already described three engines of growth in The Lean Startup (2011): sticky, viral and paid. The idea is older than either. Tupperware parties ran on it.

What those writers mostly studied was software, where the next user costs nothing to serve. A DTC brand ships a box. Every customer the loop brings carries cost of goods, shipping and a reward. So the question here is narrower: what does it cost to make a customer bring a customer, and when does it pay?

The four parts

1. A trigger inside the useA moment when using the product involves another person. Sending money involves the recipient. Sharing a folder involves a colleague. Going live involves an audience. Without a trigger, a referral program is a button waiting for someone to feel generous.
2. A currencyWhat the inviter gets for bringing someone, and what it costs you to print. Cash, credit, product, status, a share of revenue, a chance at a prize. The currency decides whether the loop pays for itself.
3. Completed valueThe event that counts. An invite isn't a customer, and a signup isn't either. The loop turns when the new person does the thing that earns you money, and the reward waits for it.
4. Retention underneathOnly active customers trigger anything. A customer who churns after one order invites no one after that order. The Second Order was about this part.

An invite isn't a customer. The loop turns on completed value.

Five loops, one table

Parts two to four take four famous loops apart, and OVRLND runs through part five. Here they are side by side.

Read down the currency column. Only PayPal paid in cash, and PayPal is the one that had to stop. Everyone else pays in something that costs them less than it's worth to the customer, and three of them pay only after the new customer has produced revenue.

Why most DTC referral programs aren't loops

Most brands install a referral app, set "give $15, get $15," put a link in the footer and a block in the post-purchase email, and call it a loop. It has a currency. It usually lacks the other three parts.

There's no trigger: nothing about using a moisturizer or a hoodie involves another person. The reward fires on the friend's first order, often before the return window closes. And nobody tracks whether the inviters are still customers in ninety days.

So the program collects codes from people who were buying anyway, shared into group chats full of people who were buying anyway. The dashboard shows referral revenue. Total new customers don't move.

That's not a reason to skip the loop. It's a reason to build all four parts.

Draw yours

Do this

• Fill in the loop canvas above with the four parts named: trigger, currency, what counts, and who has to stay active for it to turn.
• Circle the part you can't name. That's the chapter to read next.