Grow Without Breaking
Pick one engine of growth
You're on social media, running ads, begging for referrals, and dropping prices — a little of everything, and none of it compounds. Growth isn't four half-efforts; it's one engine you master.
Spreading your money and attention across every growth tactic feels safe, but it's the surest way to grow slowly. Each engine needs sustained focus to catch; run three at 30% each and all three stay cold.
There are only three engines of growth, and each turns on a single number. Sticky: you keep customers longer than you lose them (acquisition beats churn). Viral: customers bring customers (viral coefficient k > 1). Paid: you reinvest profit to buy customers (lifetime value beats cost to acquire). Pick the one that fits your business and obsess over its number.
- Sticky — you win when new customers arrive faster than old ones leave. The number: acquisition rate vs. churn rate.
- Viral — you win when each customer brings in more than one new customer. The number: viral coefficient k, and you need k > 1.
- Paid — you win when a customer is worth more over their life than it costs to win them. The number: LTV vs. CAC.
- Rule: choose the engine that matches how people naturally find you, and ignore the other two until it's maxed out.
Hotmail added one line to the bottom of every email its users sent: 'PS: I love you. Get your free email at Hotmail.' Every message became an advertisement, and every recipient a prospect.
→ It grew from zero to about 12 million users in roughly 18 months on a tiny budget, and Microsoft bought it for around $400 million.
The trick worked only because email is inherently passed person to person; founders who bolt a 'refer a friend' banner onto a product nobody naturally shares get a viral coefficient far below 1 and no growth at all.
Never buy growth before you've proven people keep the value. Paid ads pointed at a product with high churn is pouring water into a bucket full of holes — you spend more to fill it while it drains just as fast. Fix retention first, then pour.
Pick by fit, then compute one number. If customers naturally return (sticky), measure repeat rate against churn. If they naturally refer others (viral), count how many each one brings — you need more than one. If neither is strong but the math works (paid): if a customer is worth 2,000 over their life and an ad wins one for 200, LTV beats CAC ten-to-one — scale that engine and ignore the rest.
Name your single engine in one sentence: 'We grow mainly because ______.' Then compute its one number this week — repeat rate, referrals per customer, or lifetime value vs. acquisition cost. Next month, move only that number.
Growth compounds through one engine, not four. Prove people keep the value, pick the single engine that fits, obsess over its one number, and ignore the other two until it's maxed.
Grow Without Breaking