The Profitability Framework Most Candidates Get Wrong

Profit = Revenue − Cost is true and useless. Everyone knows it; almost no one uses it to find the actual driver of a profit decline. The version that works adds one discipline: decompose each side until you hit a number you can independently size, then test each branch against the timeline of the problem.

Decompose before you diagnose

• Revenue → Volume × Price, then Volume → Customers × Frequency × Basket size
• Cost → Fixed vs. Variable, then Variable → Unit cost × Volume

Write out every branch before picking one to chase. The branch that moved right when the problem started is almost always the right one — and it's rarely the branch the case-giver expects you to jump to first.

Match the timeline

If profit dropped sharply eight months ago, ask what else changed eight months ago: a competitor launch, a price change, a supplier contract, a channel shift. A framework without a timeline turns into a scavenger hunt through every possible driver instead of a targeted diagnosis.

Say the number, not the category

"Cost went up" is not an answer. "Variable cost per unit rose 14% after the June supplier renegotiation, which explains roughly 80% of the margin decline" is. The gap between those two sentences is the entire skill being tested.

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This is the exact diagnostic sequence we walk through in 1:1 sessions — bring a real case and we'll work it live.