Marketing in a Minute – Episode 19 | Ahmed Moaaz

Customers who stay accumulate; customers who leave leak your ad money. Measure both groups monthly – growth with high churn is like running on a treadmill.

Retention and churn: two faces of one number

Every month, two simultaneous events happen in your business: customers returning to buy again, and customers stopping their return forever. The first is called retention, the second is called churn. They are two faces of one coin, and together they decide whether your business accumulates or leaks like water from a punctured vessel.

Retention rate = (customers at end of period – new customers during it) ÷ customers at its start × 100. Churn rate = those who stopped buying ÷ customers at the start of the period × 100.

Example: you started the month with 500 customers, added 120 new ones, and ended with 540. Retention rate = (540 – 120) ÷ 500 = 84%. Churn rate = 80 ÷ 500 = 16%.

Why does retention beat acquisition economically?

• Cost: convincing an existing customer to buy again costs a small fraction of bringing a new one, because you do not need an ad introducing you from scratch.
• Value: old customers buy at higher averages, trust you more and try your new products faster.
• Referral: a satisfied, continuing customer brings their friends for free, becoming an acquisition channel themselves.

The famous rule says raising retention by a few percentage points lifts profits by a far larger share, because its effect compounds: every customer you keep continues buying in every coming period, not just once.

How do you know a customer has “left”?

In subscriptions it is clear: they cancelled, so they left. In e-commerce you need a working definition: look at the natural period between your customers’ purchases, and consider whoever passes double or triple that period without buying as gone. A coffee store whose customers buy every 45 days, for example, treats anyone passing 120 days without an order as at risk of leaving – or already gone. The definition is not sacred; what matters is choosing a fixed threshold and measuring against it consistently.

Why do customers leave?

• A bad experience: late delivery, a product below expectation, or customer service that did not solve their problem. One bad experience can erase three good ones.
• Their need ended: they bought for an occasion or a gift and do not need the product regularly. Some leaving is natural, not failure.
• They found an alternative: a competitor with a lower price, a better experience, or simply an ad that appeared at the right moment.
• They forgot you: the most common and most underestimated reason. The customer is not angry; life got busy and you never reminded them you exist.

Notice that two of the four reasons are under your direct control, and forgetfulness alone is treated with the cheapest marketing tool in existence: regular messages.

How do you keep those who stay and recover those about to leave?

• Make the first experience unforgettable: fast delivery, careful packaging and a genuine thank-you message create the impression that decides whether they return.
• Communicate without a sales occasion: useful content and product-usage tips keep your name alive without annoying anyone.
• Remind at the right time: a consumable that runs out after a month deserves a reminder on day twenty-five, not day two.
• Reward repetition: points, an escalating discount or a gift with the fifth order; give loyalty a tangible price.
• A win-back campaign for the vanished: a message to those who have not bought in a while with a limited return offer. Even if a small share returns, it comes at nearly zero cost.
• Ask those who left why: a short, honest message: “We missed you – did something go wrong?” Their answers are a treasure of information, and some return from the message itself.

A practical example with numbers

Two similar stores, each adding 100 new customers a month. The first has a monthly churn of 15%, the second 8%. After one year, the first holds about 570 active customers while the second holds about 790. Exactly the same acquisition effort, and a gap approaching 40% in customer-base size – from a few churn points alone. And as the years compound, the gap widens toward nearly double in the long run, a gulf ads alone cannot bridge.

How do you measure it practically without complex systems?

The simplest practical way is tracking cohorts of new customers month by month. Take January’s customers, and ask every following month: how many of them bought again? After one month perhaps 30% return, after three months 18%, after six 12%. That curve is your retention fingerprint, and it tells you two things: when customers stop returning, and which improvements moved the curve when comparing one cohort to another. Most store platforms and email marketing tools show these reports ready-made today; if you lack them, a simple sheet with each month’s customers and their last order date does the job completely.

One last important point: do not measure retention on the average of all your old customers together, because loyal ancient customers hide the bleeding of the new. Cohort measurement is what reveals the truth.

What do you do with the curve after drawing it?

Look for the sharp drop point. If 60% of customers buy once and then disappear, the problem is in the first experience or in the absence of communication after it. If they buy three times then stop, look for what changes after the third order: does product excitement run out? Do your messages stop? Every drop point is a specific improvement opportunity.

Summary

Real growth = what you add minus what you lose. Watch the retention rate monthly as you watch sales, define “leaving” with a fixed time threshold, and treat its four causes in order: an excellent first experience, regular communication, reminders at the right time, and win-back campaigns for the vanished. The cheapest new customer you will ever get is an old customer you did not let leave.

Keep following Marketing in a Minute: one marketing concept per episode. Have a question about this number? Send it on WhatsApp.