Morning. The same ten per cent fall in revenue is a difficult quarter for one business and an extinction event for another. The difference is already sitting in your cost base.
Finance.
Operating Leverage
If revenue fell fifteen per cent next quarter through nothing you did wrong — a slow market, one client pausing, a season that never arrived — would profit fall fifteen per cent, forty, or straight through zero? Two subtractions and a division, off your own P&L, answer that in about four minutes. Every month you haven't run them is a month you've carried a risk you can't size.
Sort your costs by how they behave rather than by what they're called, and a multiplier falls out of the page. Charles Horngren put that discipline at the centre of Cost Accounting: A Managerial Emphasis, whose first edition appeared in 1962, and he spent most of his career teaching it at Stanford; most managers abandon it on leaving the classroom. Take the contribution your sales produce — revenue minus every cost that moves with volume — and divide it by operating profit. The answer is a multiplier. A business sitting at four converts each one per cent of revenue movement into roughly four per cent of profit movement. Fixed costs buy you that multiplier, and on the way up it's entirely real. The trap is the reverse gear: the identical sum runs backwards at the identical speed, and it is the direction operators almost never model. Horngren paired the ratio with the margin of safety, the distance revenue can fall before it reaches the break-even point of Day 37, and read together the two say precisely how much bad news your cost base was built to absorb.
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