Business Quality · Stocks Explained
Separate variable and fixed costs
Operating leverage arises when a business has costs that do not fall quickly with revenue. Factories, leases and staff can make a modest sales decline produce a much larger profit decline. Cost behaviour depends on the time horizon.
A cost that is fixed this quarter might be reduced over several years. Conversely, a growing business may need a new factory before it can serve the next customer. Avoid extrapolating a single margin through every stage of a cycle.
Stress the operating model
A hypothetical manufacturer has revenue of $100 million, variable costs of $50 million and fixed operating costs of $30 million. Operating profit is $20 million. If revenue falls 20% and variable costs remain half of revenue, operating profit becomes $10 million.
Revenue fell 20%, but operating profit fell 50%. If price competition also raises the variable cost ratio, the result is worse. This calculation isolates one mechanism rather than predicting the company’s actual next year.
Add financial obligations
If annual interest expense is $5 million, operating profit covers interest four times initially and twice in the stress case. This simple coverage ratio does not account for principal repayments, capital expenditure, tax or the timing of cash receipts.
Review cash balances, committed facilities, maturity dates, covenants and floating interest exposure. A company may have accounting profits while facing a refinancing problem. Do not assume that a loan can always be renewed on the same terms.
Normalise with a range
Commodity producers, banks, manufacturers and other cyclical businesses can look cheapest on earnings multiples when profits are unusually high. Compare volumes, prices, margins and credit losses across a full range of conditions.
Build a normal, weak and severe case. Identify which costs can actually be reduced and what liquidity survives. Treat normal earnings as a reasoned estimate with disclosed assumptions, not a precise historical average that must return.
Try it yourself
Using revenue of $100 million, variable costs of 50% of revenue and fixed costs of $30 million, what happens if revenue falls to $70 million?
Show the worked answer
Variable costs become $35 million and operating profit is $5 million. With $5 million of interest expense, simplified profit before tax is zero. Principal payments and capital spending could still require additional cash.
Further reading
Educational material. Examples are hypothetical and do not recommend a security or a personal allocation.
