Question 1

What is churn and why does it matter more than growth?

Accepted Answer

**Churn** is the rate at which customers stop paying you over a period. It is the counterweight to acquisition, and it determines whether growth compounds or leaks away.

**Two measures, and the difference matters:**

**Customer churn** — the proportion of customers lost.

**Revenue churn** — the proportion of recurring revenue lost. This can differ sharply from customer churn, because losing one large account may cost more than losing fifty small ones.

**Net revenue retention (NRR)** is the figure sophisticated businesses watch: revenue from existing customers at the end of a period, including upgrades and expansion, against the start. **NRR above 100%** means existing customers grow in value faster than others leave — the business expands without acquiring anyone. That is an unusually strong position and it is why NRR is scrutinised in software investment.

**Why churn dominates growth arithmetic.** Growth is acquisition minus churn, and churn applies to your **whole base** while acquisition adds to it linearly. At 5% monthly churn, you lose roughly 46% of customers in a year, and every new customer must first replace one lost. At high churn rates a business hits a **ceiling** — a level where new customers exactly replace departures and growth stops regardless of marketing spend. That ceiling exists mathematically and no amount of acquisition budget passes it.

Reducing churn also **compounds**: every retained customer continues generating revenue and reduces the acquisition needed forever after.

**Retention is usually cheaper than acquisition**, often substantially, though the frequently quoted "five times cheaper" figure has weak provenance and should not be treated as a measured fact.

**What causes churn**, roughly in order: failure to reach the product's value quickly (onboarding), an unresolved support problem, a champion leaving the customer's organisation, and price. **Involuntary churn** — failed card payments — is a surprisingly large share and the easiest to fix.

**Measure cohorts**, since aggregate churn hides whether recent customers behave differently.

Question 2

What is customer lifetime value, and how is it actually calculated?

Accepted Answer

The total profit you expect from a customer over the whole relationship. It is the number that determines how much you can afford to pay to acquire one — and it is calculated wrongly more often than

Question 3

What is a cohort analysis, and why is it better than an average?

Accepted Answer

Grouping users by when they started and tracking each group separately over time — which reveals changes that overall averages actively conceal. The problem with aggregate numbers. Total revenue,

Question 4

What is a retail media network, and why is every retailer building one?

Accepted Answer

A retailer selling advertising inventory against its own shopper data — on its website, in its app, in physical stores, and increasingly on other websites entirely. It has become the fastest-growing

Question 5

How do loyalty programmes actually make money?

Accepted Answer

Rarely through the loyalty itself. Most programmes earn through a combination of margin funded by suppliers, changed purchase behaviour, unredeemed value, and — for the largest schemes — selling the

Question 6

What is customer acquisition cost and how do you work out payback?

Accepted Answer

Customer acquisition cost (CAC) is what it costs, on average, to acquire one paying customer. Payback period is how long that customer takes to earn the money back. Calculating CAC. Total sales and

Question 7

How to measure marketing automation success?

Accepted Answer

Measuring marketing automation success involves tracking metrics like lead conversion rate, customer engagement, ROI, sales cycle length, and customer retention. These insights help optimize strategies for better results.

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