Market expansion
Growing into a space close to what the company already does (a new segment, channel, or nearby region) and testing whether the unit economics pass.
Key takeaways
- Anchor on the goal (how much growth, by when, at what hurdle), test one unit against that hurdle, and if it fails, work out what would have to change before you suggest a pilot.
- Expansion cases are often candidate-led, with the interviewer expecting you to drive the comparison.
- The strong answer judges the expansion on returns against the company's own rule and finds a way to make it work.
What this case type is and when it shows up
A market expansion case asks whether a company should grow into a space close to what it already does: a nearby customer segment, a new channel such as online, or a neighboring region. Much of the existing business model carries over. Market entry, the next case type, covers a market that is new to the company, where it has no presence and must build, buy, or partner for most capabilities. Many interviewers use the two names loosely and the logic overlaps; what matters is how much of the current business transfers.
The underlying theory, in plain language
Expansion is a choice among options, not a simple yes or no. The question is which segment, channel, or region gives the best return for the effort and risk, and whether the company can win there with what it already has.
Two things decide it: is the new space attractive (big enough, growing, not too crowded), and can this company win there (do its brand, cost position, and skills transfer). A space can be attractive and still wrong if the company cannot win in it.
The numbers usually come down to unit economics: what one new store, route, or customer segment earns each year compared with what it costs to open. Payback (the years needed to earn back the opening cost) is the most common test, and you compare it with the hurdle the company sets.
What the prompts sound like, from simple to hard
- Simple: should a Singapore cafe chain open stores in suburban housing estates.
- Medium: which of three Indian cities should a clothing retailer open in next.
- Hard: should a European grocer add an online channel, and in which countries first, with limited capital.
Finding and narrowing the real problem
Key idea
Anchor on the goal (how much growth, by when, at what hurdle), test one unit against that hurdle, and if it fails, work out what would have to change before you suggest a pilot.
Frameworks for this type, each as a thinking tool with its limit
- Attractiveness and ability to win: Score each option on how good the space is and whether the company can win there. Limit: Scoring can look precise while resting on weak assumptions; keep the inputs honest.
- Value chain transfer: Ask which parts of the existing value chain carry over to the new space and which must be rebuilt. Limit: It can miss demand-side issues, such as whether new customers like the brand.
Methods for solving this type
- Size each option roughly
- Compare on attractiveness and ability to win
- Test the unit economics against the company's hurdle
- If they fail, find the cost or revenue that would pass, then pilot a format that can reach it
The math patterns it relies on
- Revenue times margin for yearly profit per unit
- Payback = opening cost / yearly cash profit
- Required profit or maximum opening cost for a target payback
Worked cases
Worked case
Suburban stores for a Singapore cafe chain
The prompt
A cafe chain has 20 stores in central Singapore and is considering 10 stores in suburban housing estates. Each suburban store is expected to bring in SGD 600,000 of revenue a year at a 15 percent store-level cash margin, and costs SGD 500,000 to open. The table below compares a central store today, the suburban forecast, and an early estimate for a smaller kiosk. Should it go ahead with the suburban plan?
Interviewer-led: the interviewer shows the table and asks, in order, whether one suburban store passes the hurdle, what would have to change, and what you recommend.
Clarifying questions, with the interviewer's answers
- Is the 15 percent margin store-level cash profit, after store rent and staff but before head-office costs?Answer: Yes.
- What payback does the company require on new stores?Answer: Three years or less.
- Would suburban stores take customers from the city stores?Answer: Management expects very little overlap, so ignore it for now.
A hypothesis to say out loud: Suburban rents are lower but so is foot traffic. My hypothesis is that revenue per store is the swing factor, so I will test whether one store earns back its opening cost within the three-year hurdle.
The structure
- Does one store pass the three-year hurdle?
- Cash profit per store per year
- Key: Payback versus the hurdle
- If it fails: the revenue or opening cost that would pass
The exhibit
| Store format | Revenue (SGD a year) | Store-level cash margin (%) | Opening cost (SGD) |
|---|---|---|---|
| Central store (today, actual) | 1,400,000 | 18 | 450,000 |
| Suburban store (forecast) | 600,000 | 15 | 500,000 |
| Station kiosk (early estimate) | 350,000 | 20 | 150,000 |
Working it through
1. Benchmark: a central store
Read the first row: SGD 1.4 million of revenue at an 18 percent margin pays back its SGD 450,000 in under two years. That is why the chain wants to grow.
Central store payback (years):450,000 ÷ (1,400,000 × 0.18) = 1.792. Cash profit per store
SGD 600,000 of revenue a year at a 15 percent store-level cash margin.
Cash profit per store (SGD a year):600,000 × 0.15 = 90,0003. Payback
SGD 500,000 to open, earning SGD 90,000 a year: about 5.6 years, well above the three-year hurdle.
Payback (years):500,000 ÷ 90,000 = 5.564. The full plan
Ten stores would need SGD 5 million of capital to earn SGD 900,000 a year, with the same slow payback.
Capital for 10 stores (SGD):10 × 500,000 = 5,000,0005. Revenue needed to pass
To pay back in three years, a store must earn SGD 500,000 / 3 a year, which at a 15 percent margin needs about SGD 1.1 million of revenue, almost double the forecast.
Revenue needed per store (SGD a year):500,000 ÷ 3 ÷ 0.15 = 1,111,1116. Opening cost that would pass
Or keep the forecast profit of SGD 90,000 a year and ask how much a store could cost to open and still pay back in three years.
Maximum opening cost (SGD):90,000 × 3 = 270,0007. Test the kiosk estimate
The third row: SGD 350,000 of revenue at a 20 percent margin earns SGD 70,000 a year on an opening cost of SGD 150,000, well under the SGD 210,000 that three years of its own profit would cover.
Kiosk payback (years):150,000 ÷ (350,000 × 0.2) = 2.14
What the exhibit shows
The suburban store costs more to open than a central store but earns less than half the revenue, so it cannot meet a three-year payback. The kiosk is much cheaper to open.
The recommendation
Do not approve the 10-store plan as designed. First, each suburban store would take about 5.6 years to pay back, well above the three-year hurdle, against under two years for a central store. Second, a pilot of the same format cannot fix that: even if revenue comes in as forecast, payback stays at 5.6 years; a store would need about SGD 1.1 million of revenue, almost double the forecast, or an opening cost of SGD 270,000 or less. Third, the early kiosk estimate passes, at about SGD 70,000 a year on SGD 150,000, a payback of about 2.1 years. Pilot kiosks near train stations in two estates, and approve a rollout only if real payback comes in under three years.
Risks: The kiosk revenue is an early estimate and may be too high; Opening costs often run over budget; Kiosks near stations may take customers from nearby central stores.
Next steps: Confirm kiosk rents and fit-out costs with two landlords; Pick the two estates with the highest foot traffic for the pilot.
A strong candidate
Tested one store against the hurdle, saw that a pilot of the same format could not fix the economics, and worked out the cost or revenue that would pass.
A weak candidate
Said yes because "the suburbs are a big market," or proposed a pilot without checking whether the economics could ever pass.
Worked case
Home delivery for a South African grocer
The prompt
A grocery chain with 120 stores in Gauteng, South Africa, wants to add home delivery in Johannesburg, a new channel for the same customers and products. Should it, and how?
Candidate-led: you set the structure and ask for data; the interviewer answers only what you ask.
Clarifying questions, with the interviewer's answers
- Is the goal more revenue, or more profit?Answer: More profit; the board will not fund a channel that loses money after two years.
- Who would order online: new customers, or people who already shop in our stores?Answer: Good question. Ask me for the data when you need it.
- Would we deliver ourselves or use a partner?Answer: The plan is our own pickers and drivers from a central hub.
A hypothesis to say out loud: Grocery margins are thin and delivery is costly, so my hypothesis is that each order barely makes money, and that orders from existing store customers, which replace a store visit, could make the channel lose money overall.
The structure
- Does the channel add profit after the sales it takes from our stores?
- Contribution per order from a new customer
- Key: Effect of an order that replaces a store visit
- Fixed cost of the hub and app, and break-even orders
- Levers: delivery fee, where to offer delivery
Working it through
1. One order from a new customer
Candidate: "What does an average order look like?" Interviewer: "A basket of ZAR 700 at a 20 percent gross margin. We charge a ZAR 40 delivery fee, and picking plus delivery costs ZAR 110 per order."
Contribution per new-customer order (ZAR):700 × 0.2 + 40 - 110 = 702. One order that replaces a store visit
Candidate: "If an existing customer switches from the store, we earn the same gross margin either way, so the channel only adds the fee and the delivery cost."
Effect of a replacing order (ZAR):40 - 110 = -703. Blend the two
Candidate: "What share of orders would replace a store visit?" Interviewer: "Our survey says about 40 percent."
Added contribution per order (ZAR):0.6 × 70 + 0.4 × (40 - 110) = 144. The year-two picture
Interviewer: "We expect 500,000 orders a year by year two, and the hub and app cost ZAR 21 million a year." Candidate: "Then the channel loses about ZAR 14 million a year."
Yearly result (ZAR):500,000 × 14 - 21,000,000 = -14,000,0005. Break-even orders
At ZAR 14 of added contribution per order, the hub needs 1.5 million orders a year, three times the plan.
Break-even orders a year:21,000,000 ÷ 14 = 1,500,0006. Lever 1: a higher fee
Candidate: "Could we charge ZAR 60?" Interviewer: "Research says order numbers would hold." Candidate: "That helps, but the channel still loses money."
Yearly result with a ZAR 60 fee (ZAR):500,000 × (0.6 × (700 × 0.2 + 60 - 110) + 0.4 × (60 - 110)) - 21,000,000 = -4,000,0007. Lever 2: offer delivery where we have no store
Candidate: "What if we deliver only to suburbs without one of our stores nearby?" Interviewer: "Then only about 10 percent of orders would replace a store visit, but orders fall to about 350,000 a year." Candidate: "With the ZAR 60 fee as well, the channel makes money."
Yearly result, targeted areas and ZAR 60 fee (ZAR):350,000 × (0.9 × (700 × 0.2 + 60 - 110) + 0.1 × (60 - 110)) - 21,000,000 = 5,600,000
The recommendation
Do not launch delivery across Johannesburg as planned; launch it only in suburbs without a nearby store, with a ZAR 60 fee. First, an order from a new customer adds ZAR 70, but an order that replaces a store visit costs us ZAR 70, so with 40 percent replacing orders each order adds only ZAR 14 and the plan loses about ZAR 14 million a year. Second, a higher fee alone is not enough: the loss shrinks to about ZAR 4 million. Third, in areas without our stores only about 10 percent of orders replace a store visit, and with the higher fee the channel makes about ZAR 5.6 million a year even at 350,000 orders. Test it in three suburbs for six months before building the full hub.
Risks: The survey may understate how many orders would come from our own store customers; Rivals may offer free delivery, making a ZAR 60 fee hard to hold; Picking and delivery cost may be higher at low volume in the test.
Next steps: Map suburbs more than 5 km from our stores and size demand there; Run a six-month test using store stock before committing to a central hub.
A strong candidate
Separated new-customer orders from orders that replace store visits, found that the channel barely adds profit, and found two levers that make it work before recommending a limited test.
A weak candidate
Treated every online order as new revenue, found about ZAR 35 million of contribution, and recommended a city-wide launch that would lose money.
Prompt: "Should we expand to the suburbs?"
Weaker answer
Says "yes, the suburbs are a big untapped market," or suggests a pilot without checking whether the unit economics can ever meet the hurdle.
Stronger answer
Sizes one store, finds a 5.6-year payback against a three-year hurdle, works out that a store must cost SGD 270,000 or less to pass, and proposes piloting a cheaper format.
Why the stronger answer wins: The strong answer judges the expansion on returns against the company's own rule and finds a way to make it work. The weak one confuses a large market with a good decision.
Common mistakes, traps, and curveballs
- Assuming a bigger market always means a better decision
- Ignoring whether the company can win there
- Proposing a pilot of a format whose economics fail even if revenue comes in as planned
- Forgetting sales taken from the company's existing stores (cannibalization)
Expansion cases are often candidate-led, with the interviewer expecting you to drive the comparison. Many include an embedded sizing step, where you estimate the new market before you can judge it. Formats differ by office and change over time, so check the current process for your target office.
Practice
A new store in Pune costs INR 12,000,000 to open and makes INR 4,000,000 of cash profit a year. What is the payback, in years?
A store earns EUR 80,000 of cash profit a year. The company requires a payback of 2.5 years. What is the most the store can cost to open, in EUR?
A ramen chain in Japan can open a suburban shop for JPY 30 million. The shop would earn JPY 12 million of cash profit a year. What is the payback, in years?
One new store pays back in 6 years, and the company requires 3. What is the strongest next move?
A new online channel makes money on each order, but 40 percent of its orders replace purchases customers already made in the company's stores. What must you measure?
Option A is a bigger, faster-growing space where the client has no brand. Option B is smaller, but the client's brand and supply chain carry over. What should decide between them?
Test one unit against the company's hurdle first. If it fails, find what would have to change before you suggest a pilot.
Sources for this lesson (1)
- Recognized public explanations of case-interview concepts and frameworks
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