A Ten Percent Discount Can Take Half the Profit
Discounts come out of margin rather than revenue, so their effect depends entirely on how thin the margin already was. Most organisations grant them without seeing that arithmetic.
Where the Discount Comes From
A discount reduces price. It does not reduce cost. Every dollar given away therefore comes directly out of profit, which means the percentage effect on margin is much larger than the percentage effect on price.
Take a product sold at 100 with a cost of 80, giving 20 of profit and a 20 percent margin. A 10 percent discount drops the price to 90. Cost is unchanged at 80. Profit falls from 20 to 10.
| List | 10 percent off | |
|---|---|---|
| Price | 100 | 90 |
| Cost | 80 | 80 |
| Profit | 20 | 10 |
| Margin | 20 percent | 11 percent |
A ten percent discount on a twenty percent margin is a fifty percent profit cut. The price moved a little and the profit moved enormously.
The Volume That Would Be Needed
The usual justification is that the discount buys volume. The question is how much volume, and the answer is generally larger than anyone assumes.
To earn the same total profit after the discount above, the company needs to sell twice as many units, because profit per unit halved. Not 10 percent more. Not 20 percent more. Double.
The general form is straightforward. Required volume increase equals the discount divided by the difference between the original margin and the discount. At a 40 percent margin a 10 point discount needs a 33 percent volume increase. At a 15 percent margin it needs a 200 percent increase, which is almost never achievable.
The thinner the margin, the more destructive discounting becomes, and thin margin businesses are precisely the ones under the most competitive pressure to discount.
Why Discounts Proliferate
Discount authority tends to sit with people compensated on revenue or on closed deals rather than on margin. A salesperson paid on bookings is indifferent between a full price sale and a discounted one of the same size, while the customer is not indifferent at all. The path of least resistance is a discount.
Compounding this, discounts are usually granted individually and reviewed collectively, if at all. Each one is small and defensible on its own. The aggregate effect only becomes visible in a margin analysis that someone has to deliberately run.
Price Leakage and the Pocket Price
The formal discount is only part of it. The gap between list price and what the company actually keeps is filled with items that rarely get counted together: volume rebates, early payment terms, free shipping, promotional allowances, extended warranties, returns handling and the cost of long payment terms.
The resulting figure is often called the pocket price, and the difference between list and pocket is price leakage. Companies that build this waterfall for the first time frequently find the total concession is far larger than the headline discount, and that it varies enormously between customers in ways no one intended.
The most common finding is that the largest customers, who negotiate hardest, receive concessions out of proportion to the volume they bring, and that some accounts are unprofitable once all the terms are counted.
What Actually Controls It
Three mechanisms do most of the work. Move sales compensation from revenue to margin, so the person granting the discount bears part of its cost. Require approval to escalate as the discount deepens, so the decision moves to someone accountable for profitability. And publish the pocket price waterfall by customer, because most discount discipline problems are invisibility problems rather than judgement problems.
None of this means discounts are always wrong. Winning a strategic account, clearing inventory or entering a new market can justify one. The point is that it should be a decision with a known cost rather than a routine concession whose aggregate effect nobody has calculated.
The Bottom Line
Discounting is the fastest way to destroy profitability because it operates directly on margin while looking like a small change in price. The volume required to break even on a discount is far higher than intuition suggests and rises sharply as margins thin. The practical defences are to measure the pocket price rather than the list price, to compensate on margin rather than revenue, and to treat every discount as a spending decision, since that is exactly what it is.