Profit

Gross profit is revenue minus the cost of sales (1) — the profit a business makes before deducting its overheads (operating expenses) (1).

Gross profit = £200,000 − £120,000 = £80,000, so gross profit margin = (£80,000 ÷ £200,000) × 100 = 40% (Knowledge 1 + Application). Operating profit = £80,000 − £40,000 = £40,000, so operating profit margin = (£40,000 ÷ £200,000) × 100 = 20% (Application 2 + Analysis 1).

Way 1 — reduce overheads. Operating profit = gross profit − overheads (Knowledge). SqueezeCo could strip out operating expenses — cheaper premises, leaner staffing, tighter control of warehousing and distribution overheads, cutting waste (Application). Lower fixed overheads on the same revenue raise operating profit and its margin, widening the proportion of each £ of sales it keeps after cost of sales (Analysis).

Way 2 — improve the gross margin. A higher gross margin feeds through to operating profit (Knowledge). SqueezeCo could raise price where demand is inelastic, or cut cost of sales by renegotiating supplier terms and securing bulk-buying discounts (Application). This lifts gross profit per unit and hence the operating margin, retaining more of every £ of revenue before overheads (Analysis).

A low profit margin can, on the face of it, look like poor performance: it means DiscountMart keeps little profit on each £ of sales, so it operates on a thin cushion — if input costs rise or footfall falls, it could quickly slip into loss. On this measure alone, DiscountMart looks weaker than its premium rival.

However, this comparison is misleading, because DiscountMart is a discount retailer whose whole model is low margins driven by rapid inventory turnover — 'pile it high, sell it cheap'. A low margin is therefore expected and deliberate, and DiscountMart can still generate high total profit by pushing far greater sales volumes through the same shelf space than a premium rival, even at a low average transaction value. Comparing its margin to a premium retailer — with a completely different operating model and pricing architecture — is not a fair benchmark.

Whether DiscountMart is performing poorly therefore depends on the right comparison and its total profit. Judged against other discount retailers and on its total profit, sales volume and stock-turn, a low margin is not poor performance if it reflects the deliberate high-volume strategy and throughput is strong. It would only signal poor performance if its margin fell below other discounters' or its total profit were falling. So a low margin alone does not mean DiscountMart is performing poorly — its performance should be judged against the appropriate benchmark and its overall profit, not a premium rival's margin.

GrowMargin's healthy gross margin but low operating margin is a clear diagnosis: the problem lies in its overheads, not its cost of sales or pricing. So the best way to improve profitability should target that.

The case for cutting overheads. Because the gap between GrowMargin's gross and operating margins is large, its fixed operating expenses are high. Reducing overheads — cheaper premises, leaner administration, trimming warehousing and distribution costs, cutting waste and raising process efficiency — would directly lift the operating margin without touching the already-healthy gross margin. This is the most targeted fix, since it addresses the actual cause.

Other options / limits. However, cutting overheads has limits and risks: some overheads (e.g. marketing spend, key skilled staff) drive revenue, so cutting them could depress sales. Alternatives include raising revenue to spread fixed overheads across more sales (improving the operating margin through better capacity utilisation rather than cost-cutting), or, if the gross margin could be pushed higher, raising price or cutting cost of sales via cheaper suppliers — though the gross margin is already healthy, so there's less to gain there. GrowMargin could also invest to grow volume, diluting fixed overheads per unit.

Judgement. On balance, the best way for GrowMargin to improve profitability is to tackle its overheads — since the healthy gross margin shows the problem is operating expenses, not pricing or cost of sales — but it must cut only overheads that don't drive revenue, and could combine this with growing revenue to spread fixed overheads. Simply cutting costs blindly risks harming sales; the targeted answer is to strip out non-productive overheads and raise volume. So the most effective route depends on which overheads can be cut without losing sales, guided by the diagnosis that operating expenses — not gross margin — are GrowMargin's problem.

Profit margins are a widely-used measure of performance, and InvestCo is relying on them — but they capture only part of the picture, so their value as a measure depends on how they are used and what else is considered.

Why margins are a good measure. Margins show how much of each £ of sales becomes profit, so they reveal a firm's pricing power and cost control — a high margin suggests an efficient, well-differentiated business. They allow useful comparison over time (is the firm improving?) and against competitors, and the three layers (gross, operating, profit for the year) help diagnose where profit is made or lost — a falling gross margin points to cost of sales, a falling operating margin to overheads. For InvestCo, high margins genuinely signal a business that keeps a lot of its revenue as profit.

Why margins are not enough. However, margins alone can mislead. First, a margin is only meaningful relative to the sector and operating model — a discount retailer's low margin on rapid inventory turnover is not poor performance, while a premium brand's high margin is expected; comparing across models misleads. Second, margins say nothing about scale or total profit — a high-margin firm may be tiny in sales volume, a low-margin one huge; nor about growth. Third, and crucially, margins are not cash — a high-margin firm can still have poor liquidity, with cash locked in inventory and receivables, and be at risk of failure. Margins also ignore non-financial performance (brand, customer retention, staff, market share) and can be manipulated or reflect one strong year. For an acquisition, judging InvestCo's target on margins alone is dangerous.

Evaluation. How good a measure margins are depends on context and what they're compared with. They are most useful alongside a benchmark (the same firm over time, or direct competitors in the same sector), and combined with other measures — total profit, growth, liquidity ratios (can it cover its short-term debts?), cash flow, and non-financial indicators. Used in isolation, margins can flatter a firm that is small in scale, cash-poor or riding a favourable one-off year; used in context and with other data, they are a valuable indicator.

Conclusion. On balance, profit margins are a useful but incomplete measure of performance for InvestCo's decision. They reveal important information about profitability, pricing and cost control, and are worth using — but they should not be the sole basis for judging the acquisition. InvestCo should assess margins relative to the target's sector and operating model, and combine them with total profit and growth, liquidity and cash-flow analysis, and non-financial factors to avoid buying a business that looks profitable on margins but is small in scale, cash-strapped or declining. So margins are a good starting point, but a good measure of overall performance requires judging them in context and alongside other financial and non-financial measures.