McKinsey Case Interview Example: Profitability & Capex Decision

In this McKinsey-style case interview example, we walk through a complex profitability and capex decision for Big Green Fuel Systems, a biofuels company evaluating whether to invest $150M to scale production of a breakthrough ethanol product. You’ll see how strong candidates structure ambiguous, multi-path problems, evaluate long-term profitability under uncertainty, and pressure-test whether a capital-intensive investment can meet a strict 10-year payback requirement. This walkthrough helps candidates practice staying structured, analytical, and hypothesis-driven even when the case feels open-ended. 01:16 – Case Intro 02:01 – Clarifying Questions 03:24 – Case Structure & Framework 05:15 – Profitability & Capex Math 10:05 – Risks & Creative Analysis 12:00 – Final Recommendation