GLOSSARY // Fundamentals
Operating Leverage
Operating leverage is the multiplier that fixed costs place between revenue growth and profit growth. When a large share of costs — rent, salaries, data centers, factories — does not move with sales, each incremental revenue dollar arrives with little incremental cost attached, so profits swing much harder than the top line in both directions.
It is the mechanism behind the phrase "revenue grew 10% and earnings grew 40%." High-fixed-cost businesses (semiconductors, airlines, exchanges, software past its build-out phase) enjoy explosive margin expansion as revenue scales past the fixed-cost base. Low-fixed-cost businesses (staffing, distribution, groceries) convert revenue growth to profit growth at close to one-for-one.
The same gearing punishes on the way down. An airline that loses 15% of revenue does not lose 15% of profit — it can swing from record earnings to losses because the planes, gates, and crews cost nearly the same either way. Reading a company's operating leverage from its last few years of margins tells you what a recession will do to its earnings before the recession arrives.
A company runs $100M of revenue against $60M of fixed costs and variable costs equal to 20% of sales: operating income = 100 - 60 - 20 = $20M. Revenue grows 10% to $110M: operating income = 110 - 60 - 22 = $28M, a 40% profit jump on 10% growth. Revenue falls 10% instead: 90 - 60 - 18 = $12M, a 40% profit drop. Four points of profit swing per point of revenue, in either direction.
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Educational only — not financial advice. Definitions simplified for clarity; markets are messier than definitions.