Most customers will not leave when you raise prices

Most of your customers will not leave. On a 40% contribution margin, a 5% price rise still leaves you better off even if 11.1% of your volume walks out — and a 5% rise rarely costs anything like that. The risk is not departure. The risk is applying one rise evenly to a customer base that was never even.

One sentence has to be dealt with first, because in an owner-led company it is usually the sentence doing the real work in the pricing decision. It goes something like: Herr Müller has been with us since 1994. It is true. It is not an analysis, and it has never been contradicted by one.

The question is asked backwards

The question carries a hidden assumption — that there is one price, applying to everyone, which moves up or down as a single dial. Almost no company has one type of customer. Almost every company has one price list. That mismatch is where the money is. The useful question is which parts of your base are subsidising which, and what I usually find is the same shape every time: the largest and oldest accounts are subsidised by the newest and smallest.

The reason is structural, not moral. A large account negotiated its terms at the moment it was being won, when the pressure to win it was at its peak. Then the concession stayed. It survived three cost increases, a currency move and the departure of both people who knew why it had been granted, because revisiting it meant reopening a conversation with the customer who matters most. The accounts signed last year pay close to list, because there was never a reason to do otherwise.

The price list in most owner-led companies is not a commercial document. It is a record of who was in the room when each deal was struck, and how long ago.

Seen that way the decision changes shape. You are not deciding whether to raise prices. You are deciding whether to keep honouring judgements made by people who have left the building, under conditions that no longer hold. That is a far easier thing to discuss without anybody feeling accused.

Losing your smallest accounts can raise your profit

This gets repeated as a slogan often enough that it has stopped meaning anything, so here is the arithmetic. The figures are illustrative, constructed to show the shape of the calculation and not drawn from any study. Take a distributor with two hundred accounts and a book of CHF 8,000,000. The smallest twenty turn over about CHF 8,000 each a year at a 30% gross margin: CHF 2,400 of gross profit per account. Each places around twelve orders a year, and every order is picked, packed, invoiced and — often enough to matter — chased. Call that CHF 180 of genuinely absorbed cost per order: 12 × 180 = CHF 2,160. Add credit checking, statements and a sales call, at CHF 900. Cost to serve, CHF 3,060.

CHF 2,400 against CHF 3,060 is a contribution of minus CHF 660 per account, or minus CHF 13,200 across the twenty. Those accounts produced CHF 160,000 of revenue, 2% of the book, and negative profit. Revenue and profit are different numbers here, and only one of them pays anybody. It understates the loss, too, because it prices the cash and not the capacity those accounts absorb.

At the other end, one large account may be running a legacy discount — say CHF 900,000 of revenue at 22% margin against a book average of 30%. That is 8 points on CHF 900,000: CHF 72,000 of margin a year, given away quietly. Revenue rising while profit falls is usually these two facts at once.

How much volume you can actually afford to lose

There is a formula for this, short enough to check on paper. Raise price by a proportion p, with a contribution margin m expressed as a fraction of price. The maximum share of unit volume you can lose while ending up with the same total contribution is c = p ÷ (p + m). A 5% rise on a 40% margin gives c = 0.05 ÷ 0.45 = 11.1%. You could lose one unit in nine and stand exactly where you started.

Break-even volume loss on a price rise, calculated as c = p ÷ (p + m). Arithmetic, not a study.

Contribution margin	Volume you can lose on a 5% rise	Volume you can lose on a 10% rise
20%	20.0%	33.3%
30%	14.3%	25.0%
40%	11.1%	20.0%
50%	9.1%	16.7%
60%	7.7%	14.3%

Read down the columns rather than across the rows. On a 5% rise, a business at a 20% margin can shed a fifth of its volume and stay level; one at a 60% margin can shed 7.7%. The lower your margin, the more volume a price rise can afford to lose.

Most owners assume the reverse, because thin margins feel fragile. But on a thin margin each unit was contributing very little anyway, so losing it costs very little, while the rise lands on every unit that stays. If you have been told your margins are too tight to move price, that is this argument made backwards.

Why generic price-increase advice fails

The evidence here is unambiguous, and it is embarrassing for the people who supply the advice.

97 in 100 companies failed to achieve their price-increase targets, in Simon-Kucher's Global Pricing & Sales Study 2017 of around 2,000 companies.

The same study found companies realised 32% of the increases they planned. Run that against a typical target: 5% × 0.32 = 1.6%. The announcement said five. The invoices said one and a half. Eight years on, Simon-Kucher's Global Pricing Study 2025 — more than 2,200 leaders across 28 countries and 39 industries — puts average realisation at 43%, better than 32% but down five points in two years, from 48%. On the same arithmetic a 5% target now delivers 2.15%. Meanwhile 64% report higher pricing pressure than before, against 57% in 2021, and only 40% rank pricing as their top profit lever.

The reason generic advice fails sits inside those figures. A rise announced across a whole book is not one decision. It is several hundred separate negotiations, each conducted by a salesperson with a relationship to protect and a monthly number to hit, and in every one of them the path of least resistance is a quiet exception. Realisation is what survives the exceptions. No script fixes that, because it is not a communication problem — the rise was designed at the level of the price list and executed at the level of the account. Inaction, meanwhile, is the majority position: of 5,412 independent professionals surveyed for the Freelancer-Kompass 2026 across DACH, 62% planned no change to their rates, 29% an increase and 9% a decrease.

What the profit-lever numbers prove, and what they do not

You will have met the claim that price is the most powerful lever on profit. It comes from a specific place. Marn and Rosiello, in Harvard Business Review in 1992, took the average economics of 2,463 companies in the Compustat aggregate and asked what a 1% improvement in each variable would do to operating profit.

Effect of a 1% improvement on operating profit — Marn & Rosiello, Harvard Business Review, September–October 1992, average economics of 2,463 Compustat companies.

Lever improved by 1%	Change in operating profit
Price	11.1%
Variable cost	7.8%
Volume	3.3%
Fixed cost	2.3%

McKinsey Quarterly ran the same arithmetic a decade later on S&P 1500 economics: a 1% price improvement yields an 8% increase in operating profit, against 5.3% for a 1% cut in variable costs and 2.7% for a 1% rise in volume.

Now the caveat, which I state every single time I use these figures, because without it they mislead. This is arithmetic performed on average company economics. It is not an empirical finding about what happens when firms raise prices. It holds volume constant — precisely the assumption under question here. Raise price by 1% and lose 3% of volume and the 11.1% does not appear anywhere.

Something else in those studies is worth more than either headline. The same arithmetic, run independently a decade apart, gives 11.1% and 8%. The method did not change; the companies averaged did. That gap shows how far the famous number depends on whose economics go into it, and it is the best reason to run the calculation on your own accounts.

What actually decides how far you can go

Four things, and none of them appears on your price list.

What the buyer is willing to pay, segment by segment. Willingness to pay is a property of the buyer's situation, not of your product. The same machine sold to a contract manufacturer running three shifts and to a workshop running one is worth different amounts, because an hour of downtime costs them different amounts. One price for both is a decision to be wrong twice.

How many genuine substitutes the buyer has. Not how many competitors exist — how many the buyer would actually accept, once qualification, approvals and the person who signs off a change are counted. This is the whole of price elasticity of demand turned into a question answerable from your own sales history: when a customer left over price, who did they go to, and how many came back?

What it costs the buyer to switch. Requalification, retooling, retraining, the sunk cost of a specification written around your part. Switching costs are why a buyer with ten alternatives on paper behaves like a buyer with two, and why a rise on an embedded component lands differently from a rise on something bought out of a catalogue.

Whose money is being spent. The employee is optimising for something other than price: not being blamed, not rerunning a tender, not explaining a supply failure on a Monday morning. A 4% increase invisible inside a departmental budget costs them far less than replacing you. That is not cynicism. It is the decision they are facing.

Together those four give you a map rather than a tolerance figure — some accounts absorb 8% without a phone call, some absorb 3% after a conversation, and two genuinely go. Concentration changes the answer again: a rise on a customer who is 40% of revenue is not a pricing decision. It is a bet on the business.

Why the founder cannot hear this from a family member

This part decides whether any of the above is ever implemented, and it has nothing to do with the analysis. When a son, a daughter, a brother or a spouse proposes repricing the old accounts, the objection that comes back is almost never commercial. It is that a relationship is being renegotiated. Herr Müller stayed in 2009 when others did not. He took the shipment that was three weeks late. The founder is not defending a margin. They are defending a history — and the person raising it is read as disloyal rather than as right.

Family members cannot win that argument, because they are inside it. Whatever they say arrives carrying everything else the family has ever disagreed about, so the analysis and the relationship get argued in the same breath, and the relationship wins. It should win. That is what a family is for.

What changes the argument is the source. When the same numbers arrive from outside the family — cost to serve per account, margin by segment, the discount granted in 2009 for volume that has since halved — the subject of the disagreement moves. It stops being about who is loyal and becomes about whether CHF 72,000 a year is a reasonable price for that loyalty. Sometimes the founder decides it is, which is a legitimate answer honestly arrived at. What has changed is that it is a decision rather than a habit.

What this looks like in practice

The work has a predictable shape, and none of it begins with a price. It begins with the accounts, rebuilt so that revenue, gross margin and cost to serve sit side by side per customer. Most companies have the first two and not the third, which is why the third is where the surprises live. Cost to serve does not have to be perfect — an honest allocation of order handling, delivery, credit and sales time is enough to separate the top decile from the bottom.

Then the base gets split, usually into four or five groups: large and correctly priced, large and historically underpriced, small and profitable, small and not, and the handful that are strategic for reasons unrelated to this year's margin. Each takes a different move, and only one of those moves is a percentage. The break-even test then runs at each group's own margin, so the conversation about risk happens with a number inside it — which is what stops a sales director talking a 5% programme down to 1.6% by exception, one account at a time, with the best intentions.

What comes out is not a new price list. It is a sequence: which accounts move first, by how much, on what notice, and what the true answer is when a customer asks why now. In a family firm that last item is the hardest thing on the page to write and by some distance the most valuable. The mechanics of the conversation matter less than having settled beforehand what you are willing to hear back.

What none of this can tell you from the outside

I cannot tell you how much you can raise your prices. Nobody can from here, and anyone offering a percentage without seeing your accounts is describing their last client.

The answer sits in facts specific to you, most of them already in your building, unassembled. Contribution margin by product line rather than in aggregate. Cost to serve by account. How much volume sits with customers holding a qualified alternative, and how much with customers who would have to requalify. What happened the last two times you moved a price, and which accounts actually left rather than threatened to. Whether the discounts on your largest accounts were granted for volume that still exists. That last one catches a great many companies, in the same direction every time.

Here is the part that should give you pause. Your accountant will not produce this, because it is not what they are engaged to do — they are producing a true and fair view of what happened, not a segmentation of your base by profitability. Your auditor will not. Your bank will not, unless you are borrowing. Your sales director has the strongest imaginable incentive not to. So the analysis governing the largest single lever on your profit is, in most owner-led companies, nobody's job at all. It was not done badly. It was never commissioned. The numbers that would settle it are a few days of work away from data you already own.