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Business basics for non-business learners
Lesson 6 of 6 Math checked Facts checked against sources on 16 June 2026 9 min

Industry primers: airlines, pharma, software, energy

Four more industries you will meet often in cases, one page each.

Key takeaways

  • Each industry has one or two numbers that explain most of its profit: for airlines it is how full the planes are, for pharma the life of its patents, for software how long customers stay, and for energy the price of what it sells.
  • Generic makers can then sell copies at much lower prices, so the original drug loses much of its volume and price.
  • Above 100 percent means the existing customer base spends more this year than last, even after some customers leave.

Key idea

Each industry has one or two numbers that explain most of its profit: for airlines it is how full the planes are, for pharma the life of its patents, for software how long customers stay, and for energy the price of what it sells.

Airlines
Airlines
TopicDetails
How it makes moneyTickets, plus extras such as bags, seats, and cargo. Revenue = seats offered (capacity) x load factor (share of seats filled) x average fare.
Biggest costsFuel (one of the largest), staff, aircraft ownership or leases, airport and navigation fees, maintenance
Key metricsLoad factor; RASK (revenue per available seat kilometre: revenue divided by seats offered times kilometres flown); CASK (cost per available seat kilometre, calculated the same way for costs); aircraft utilization (hours flown per day); on-time performance
Typical case questionsShould we open a new route? How do we respond to a low-cost competitor? What do we do when fuel prices jump?
Regional exampleGulf airlines based in hubs such as Dubai and Doha earn much of their revenue from passengers connecting between Europe, Asia, and Africa

So-what

An empty seat earns nothing once the plane leaves, so airlines work hard to fill seats and adjust prices.

Pharmaceuticals
Pharmaceuticals
TopicDetails
How it makes moneySells patented medicines at high prices while the patent protects them, then faces cheaper copies (generics) after it ends. Generic makers earn from high volumes at low prices.
Biggest costsResearch and development (many drugs fail in trials), sales and marketing to doctors, manufacturing
Key metricsDrug pipeline (drugs in development), R&D spend as a share of revenue, peak sales of each drug, years of patent protection left
Typical case questionsShould we launch this drug, and at what price? How do we respond when our patent ends? Should we buy a biotech company?
Regional exampleIndia is one of the largest makers of generic medicines, supplying many countries at low cost

So-what

When a big patent ends, sales of that drug can fall fast. This is often called a patent cliff.

Software sold as a subscription (SaaS)
Software sold as a subscription (SaaS)
TopicDetails
How it makes moneyMonthly or yearly subscriptions per user or per company. Revenue repeats as long as customers stay.
Biggest costsEngineers, sales and marketing to win customers, cloud hosting, customer support
Key metricsAnnual recurring revenue (ARR: the yearly value of all active subscriptions), churn, net revenue retention (revenue kept from existing customers including upgrades), CAC, LTV, gross margin (often high)
Typical case questionsHow do we grow ARR? How should we set price tiers? Why are customers leaving?
Regional exampleMany software companies in India and Singapore sell to customers worldwide and price in USD

So-what

Net revenue retention above 100 percent means existing customers alone grow revenue, even with no new customers.

Energy (oil and gas, power utilities, renewables)
Energy (oil and gas, power utilities, renewables)
TopicDetails
How it makes moneySells oil, gas, or electricity. Revenue = volume x price. Oil and gas prices are set by world markets. Many power utilities have prices set or limited by a regulator.
Biggest costsVery large upfront investment (wells, pipelines, power plants, solar and wind farms), then operating and maintenance costs, and fuel for some power plants
Key metricsProduction volume, cost per barrel or per megawatt hour, capacity factor (actual output divided by the output at full power all the time), regulated return, carbon emissions
Typical case questionsShould we invest in a solar or wind farm? How should an oil company plan for the energy transition? Is this power plant worth building?
Regional exampleGulf countries such as Saudi Arabia and the UAE are major oil producers that are also building very large solar projects

So-what

Energy projects cost a lot upfront and pay back over many years, so investment cases often use NPV and payback.

Timed math drill

A flight has 180 seats and 153 passengers. What is its load factor, in percent?

Check your understanding

What usually happens to a medicine's sales when its patent ends?

Check your understanding

A software company has net revenue retention of 110 percent. What does that mean?

Check your understanding

Which is the best first question in a case about building a solar farm?

Sources for this lesson (1)
  • Recognized public explanations of case-interview concepts and terms
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