Revenue growth and growth strategy
Growing revenue using a complete split of growth sources (core, adjacent, inorganic), then sizing and ranking the options on profit.
Key takeaways
- Split growth into core (existing and new customers), adjacent (new products, segments, channels, regions), and inorganic (buy or partner), then size and rank the options on profit and ease, rather than listing ideas.
- Candidate-led formats tend to reward prioritization most. If the interviewer asks "what would you do first," they are usually testing whether you can commit, not whether you can list.
- The strong answer is complete, sized, and ranked. The weak one is a brainstorm with no judgment, which reads as someone who cannot focus.
- Why a generic structure scores lower: A grid of existing and new products against existing and new markets lists every option and sizes none.
What this case type is and when it shows up
A growth case asks how a company can grow revenue. The mistake that sinks most candidates is a long, unranked list of ideas. The win is a complete split of where growth can come from, then clear prioritization with numbers.
The underlying theory, in plain language
Revenue growth has a small number of sources. Core growth comes from existing customers (buying more often, spending more per visit, or paying a higher price) and from new customers in the markets you already serve. Adjacent growth comes from new products or services and from new segments, channels, or regions. Inorganic growth comes from buying or partnering with other companies. Together these cover every way to grow.
Price is one lever on existing customers, but treat it with care: a price rise can raise revenue per customer and push some customers to leave at the same time.
Once you have the sources, compare them on three things: the size of the prize in profit (not only revenue), the cost to capture it, and how easy and fast it is. Lead with the one or two that matter most.
Growth targets are often set as "double in three years." That needs about 26 percent growth a year, because growth compounds: each year grows on top of the last. The rule of 72 gives a quick check: 72 divided by the yearly growth rate is roughly the number of years needed to double.
What the prompts sound like, from simple to hard
- Simple: how can a gym in Dubai grow revenue by 10 percent.
- Medium: a software firm in Bengaluru wants to double revenue in three years.
- Hard: a mature UK retailer with flat sales needs a credible growth plan.
Build the structure from the goal
Three moves that give you the structure
- 1Start from the decision. How much should revenue grow, by when, and which few moves get there at the best profit?
- 2Write the maths of the goal. Revenue = customers x purchases per customer x price. Growth comes from more customers (won or kept longer), more purchases each, a higher price, or new revenue lines; buying another business adds revenue too. Size each move against the gap to the target.
- 3Let the business pick the branches. The model of the business says which lever is cheap. A subscription business grows most cheaply by losing fewer customers. A store chain often grows by opening sites. A consumer brand may grow through new channels. A firm with a mature core may need a new segment or an acquisition.
- Revenue = subscribers x monthly price x 12
- Key: Subscribers kept: monthly churn
- New subscribers: sign-ups by channel
- Price: a new plan tier or a price rise
- New revenue line: a plan with advertising
This comes from revenue = subscribers x price. In subscriptions a small fall in churn adds more than a big marketing push, so churn leads.
- Grow revenue when home demand is flat
- Price and mix: stronger grades for big projects
- Share: win contractors from rivals
- Key: New regions within trucking distance of our plants
- Buy a rival plant in a growing region
Same maths, a different business. Cement is heavy and cheap, so it travels only short distances, and growth beyond the home market depends on plants within reach.
A grid of existing and new products against existing and new markets lists every option and sizes none. The score goes to the candidate who sizes the few moves that close the gap.
Crack any case in five movesFinding and narrowing the real problem
Key idea
Split growth into core (existing and new customers), adjacent (new products, segments, channels, regions), and inorganic (buy or partner), then size and rank the options on profit and ease, rather than listing ideas.
Names you may hear, kept as questions that fall out of the goal maths
- Revenue driver tree: Which of customers, purchases per customer, and price can move, and by how much? This is the goal maths itself. Where it stops helping: Pulling one lever can hurt another, for example price up but customers down.
- Core, adjacent, inorganic: Can we grow what we already sell, sell something next to it, or buy growth? A reminder to check all three before you rank. Where it stops helping: It tells you where to look, not how much; you still must size and rank.
- Ansoff matrix (a name you may hear): Existing or new products, sold to existing or new customers: a reminder of where new revenue lines can come from. Where it stops helping: It leaves out buying growth and does not size or rank anything.
Methods for solving this type
- Split growth into complete sources
- Size the prize for each in revenue and profit
- Subtract the cost to capture it
- Rank by profit and ease, and lead with the top one or two and a first step
The math patterns it relies on
- Customers times frequency times spend
- Incremental profit per lever after the cost to capture it
- Compound growth to a target over several years
Worked cases
Worked case
Growing a Dubai gym's revenue by 10 percent
The prompt
A gym in Dubai has 2,000 members paying AED 300 a month. It wants to grow revenue by 10 percent this year. Compare two levers: 10 percent more members, or a coaching app at AED 50 a month that the gym expects 20 percent of members to buy. The app costs the gym 40 percent of its price to run. The table below summarizes the two levers.
Interviewer-led: the interviewer shows the two levers and asks you to size each in revenue and profit, then to recommend.
Clarifying questions, with the interviewer's answers
- What is the growth target and timeframe?Answer: Grow revenue by 10 percent within a year.
- Does the gym have room for more members at peak hours?Answer: Yes, peak use is about 70 percent of capacity.
- What does it cost to win a new member?Answer: About AED 600, in marketing and a first-month discount.
A hypothesis to say out loud: Gym costs are mostly fixed (rent, equipment, staff), so extra revenue turns mostly into profit. My hypothesis is that filling spare capacity with new members is the biggest lever, with an add-on product as a second, easier lever.
The structure
- Which lever gets us to plus 10 percent, and at what profit?This comes from revenue = members x monthly fee x 12, plus new revenue lines; each lever is judged on the profit it adds, not only the revenue.
- Today's revenue and the target
- Key: Core: new members (revenue minus cost to acquire)
- Adjacent: coaching app (revenue minus running cost)
The exhibit
| Lever | People affected | Price (AED a month) | Cost to capture or run |
|---|---|---|---|
| New members (10 percent more) | 200 | 300 | AED 600 per new member, one time |
| Coaching app (20 percent of members buy) | 400 | 50 | 40 percent of app revenue |
Working it through
1. Today's revenue
2,000 members paying AED 300 a month for 12 months.
Current revenue (AED a year):2,000 × 300 × 12 = 7,200,0002. The target
10 percent of today's revenue.
Growth target (AED a year):7,200,000 × 0.1 = 720,0003. New members: revenue
10 percent more members is 200 people at AED 300 a month. This assumes they join early in the year and stay.
New-member revenue (AED a year):200 × 300 × 12 = 720,0004. New members: profit after acquisition
Each new member costs about AED 600 to win. Other costs are mostly fixed.
New-member profit (AED a year):720,000 - 200 × 600 = 600,0005. Coaching app: revenue
20 percent of 2,000 members buy the AED 50-a-month app.
App revenue (AED a year):2,000 × 0.2 × 50 × 12 = 240,0006. Coaching app: profit
The app costs 40 percent of its price to run.
App profit (AED a year):240,000 × (1 - 0.4) = 144,0007. Both levers together
Add both revenues and compare with today.
Total growth (%):(720,000 + 240,000) ÷ 7,200,000 × 100 = 13.33
What the exhibit shows
Each new member pays six times the app's monthly price, and the 200 new members would bring three times the app's total monthly revenue, but each costs AED 600 to win; the app is small but cheap to add.
The recommendation
Lead with new members, and add the coaching app as a second lever. First, new members add about AED 720,000 of revenue, which meets the 10 percent target on its own. Second, after the AED 600 it costs to win each one, they still add about AED 600,000 of profit, far more than the app. Third, the app adds AED 240,000 of revenue and AED 144,000 of profit, is quick to launch, and gives a buffer if new members come in slower than planned; together the two levers give about 13 percent growth.
Risks: New members who join late in the year bring less than a full year of revenue; If new members leave early, the acquisition cost is wasted; A 20 percent take-up for the app is an estimate and should be tested.
Next steps: Launch a member referral offer to lower the cost of winning members; Test the app with 200 members for one month.
A strong candidate
Set the target in money, sized both levers in revenue and profit, and ranked them with a clear lead plus a backup.
A weak candidate
Listed eight ideas (classes, a juice bar, social media) with no sizing, no costs, and no ranking.
Worked case
Doubling an Indian online language school in three years
The prompt
An online English-language school in India, run from Pune, wants to double its revenue in three years. How should it do it?
Candidate-led: you lay out the sources of growth and ask for the numbers behind each; the interviewer answers only what you ask.
Clarifying questions, with the interviewer's answers
- Double revenue, or double profit?Answer: Revenue, in three years, without losing money.
- How does the business make money?Answer: Students pay a monthly subscription for live online English classes.
- Are there limits on what we can do, for example buying other companies?Answer: The founders would consider an acquisition if the organic plan falls short.
A hypothesis to say out loud: In a subscription business, keeping students usually matters as much as winning them. My hypothesis is that cutting churn is the biggest lever, and that organic levers alone may not quite double revenue.
The structure
- Core, adjacent, and inorganic growth, sized against the targetThis comes from revenue = students x monthly fee x 12: keep students longer, win more, and price, then sell to companies or buy a rival to close any gap.
- Key: Core: keep students longer (churn), win more, price
- Adjacent: sell to companies for their staff
- Inorganic: buy a smaller rival to close any gap
Working it through
1. Today's revenue
Candidate: "How many students, at what price?" Interviewer: "About 50,000 students paying INR 1,000 a month."
Revenue today (INR a year):50,000 × 1,000 × 12 = 600,000,0002. The target
Doubling means INR 1,200 million (INR 120 crore) a year in three years, about 26 percent growth a year.
Target revenue (INR a year):50,000 × 1,000 × 12 × 2 = 1,200,000,0003. Why the student count is stuck
Candidate: "How many join and how many leave each month?" Interviewer: "About 3,000 join, and about 6 percent of students leave each month." Candidate: "Then the school settles where joiners equal leavers: 3,000 divided by 6 percent."
Students where joiners equal leavers:3,000 ÷ 0.06 = 50,0004. Lever 1: cut churn to 4 percent
Interviewer: "Better teacher matching could cut monthly churn to 4 percent." Candidate: "Then the student base can grow to 75,000 with the same joiners."
Revenue at 4 percent churn (INR a year):3,000 ÷ 0.04 × 1,000 × 12 = 900,000,0005. Lever 2: a 10 percent price rise
Candidate: "How do our prices compare with rivals?" Interviewer: "About 15 percent below the main rivals." Candidate: "Then INR 1,100 looks possible, if churn does not rise."
Revenue with lower churn and INR 1,100 (INR a year):3,000 ÷ 0.04 × 1,100 × 12 = 990,000,0006. Lever 3: company clients
Interviewer: "A pilot suggests 200 companies could buy 50 seats each at INR 800 a seat per month."
Company-client revenue (INR a year):200 × 50 × 800 × 12 = 96,000,0007. The gap
Candidate: "Organic levers reach about INR 1,086 million. What is left?"
Gap to target (INR a year):50,000 × 1,000 × 12 × 2 - 3,000 ÷ 0.04 × 1,100 × 12 - 200 × 50 × 800 × 12 = 114,000,0008. Lever 4: close the gap by buying
Candidate: "Is there a smaller rival for sale?" Interviewer: "One, with about INR 150 million of revenue." Candidate: "That would take us above the target, with some room if a lever falls short."
Revenue with the acquisition (INR a year):3,000 ÷ 0.04 × 1,100 × 12 + 200 × 50 × 800 × 12 + 150,000,000 = 1,236,000,000
The recommendation
The school can roughly double revenue in three years, and the plan should lead with keeping students, not winning them. First, cutting monthly churn from 6 to 4 percent lets the student base grow from 50,000 to 75,000 with the same number of joiners, adding about INR 300 million a year, the largest single lever. Second, a 10 percent price rise and a company-client offer add about INR 90 million and INR 96 million, taking organic revenue to about INR 1,086 million. Third, that leaves a gap of about INR 114 million, which buying the smaller rival would close, reaching about INR 1,236 million once the student base settles at 75,000. Start with teacher matching and track churn by monthly group of new students; decide on the acquisition after one year, once the churn result is clear.
Risks: A lower churn rate takes time to show: even if churn falls to 4 percent at once, the student base reaches only about 69,000 by month 36, not 75,000, which leaves year-three revenue about INR 40 million short of the target even with the rival, so start teacher matching now and look for a further gain in churn or price; A price rise could push churn back up; Company clients may buy fewer seats than the pilot suggests; The founders asked for growth without losing money, and this plan sizes revenue only; the cost of better teacher matching, the company sales team, and the rival's price still need to be checked against profit.
Next steps: Launch better teacher matching for new students this quarter and track monthly churn by joining month; Test the INR 1,100 price on new students in two cities; Open early talks with the rival and value it.
A strong candidate
Split growth into core, adjacent, and inorganic, found that churn caps the student base, sized each lever against the target, and used an acquisition only to close a measured gap.
A weak candidate
Proposed more advertising to win new students, never asked about churn, and could not say whether the plan reached the target.
Prompt: "How should this gym grow revenue?"
Weaker answer
Lists social media, a juice bar, classes, an app, and partnerships, with no structure and no sizing.
Stronger answer
Splits growth into core, adjacent, and inorganic, sizes the two strongest options in revenue and profit, and leads with new members plus the app as a buffer.
Why the stronger answer wins: The strong answer is complete, sized, and ranked. The weak one is a brainstorm with no judgment, which reads as someone who cannot focus.
Common mistakes, traps, and curveballs
- An unranked list of ideas
- Comparing levers on revenue only and ignoring the cost to capture
- Chasing new customers while ignoring easy gains from existing ones
- Growing volume at a price that loses money
- No concrete first step
Candidate-led formats tend to reward prioritization most. If the interviewer asks "what would you do first," they are usually testing whether you can commit, not whether you can list. Formats differ by office and change over time, so check the current process for your target office.
Practice
A company wants to double revenue in three years. Does 26 percent growth a year get there? Compute 1.26 x 1.26 x 1.26.
A Mumbai cafe has 5,000 customers a month spending INR 400 each. What extra revenue a month comes from raising visits by 10 percent with the same spend, in INR?
A Singapore logistics company grows revenue about 9 percent a year. Using the rule of 72, about how many years does it take to double?
Which split covers all sources of revenue growth?
A client wants to double revenue in five years. Roughly what yearly growth does that need?
Two levers each add INR 100 million of revenue a year. Lever A costs INR 80 million a year to deliver; lever B costs INR 30 million. Which do you lead with, and why?
Split growth into core, adjacent, and inorganic sources, then rank options on profit after the cost to capture them, not on revenue alone.
Sources for this lesson (1)
- Recognized public explanations of case-interview concepts and terms
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