Price and promotion mechanics: discount types, reference prices, elasticity
- You tell promotion types apart by effect, cost and visibility rather than by feel.
- You know the legal 30-day rule on price reductions and its trap in continuous operation.
- You measure price elasticity instead of asserting it.
- You calculate before every discount how much extra volume it has to carry.
“Let's do 20 percent” is the most expensive sentence in the Amazon business. It sounds like momentum and is in fact a bet that volume rises faster than margin falls — a bet many sellers have never actually calculated. This lesson supplies the maths, the legal frame and an honest comparison of promotion types. It assumes basic unit economics (Getting started L7) and Featured Offer mechanics (Listing L14).
1Your price is several numbers
What customers call “the price” is several fields with different effects on Amazon:
| Field | What it does | Pro note |
|---|---|---|
| Item price | The price you sell at | The basis for everything else; each change is a decision, not a reflex |
| Landed price (item plus shipping) | The number that counts in competition | The Featured Offer looks at the landed price, not the item price |
| Reference / strike-through price | Creates the savings display | Legally the touchiest point in this lesson — see the next chapter |
| Promotional price | Time-limited price for deals and discounts | It expires; if you do not plan the expiry you get price jumps across the range |
| Business price and quantity tiers | Separate prices for business customers | Does not affect the consumer price but can explain volume spikes that otherwise look mysterious |
Think of a shop window. The item price is the tag on the product. The landed price is what shows at the till. The reference price is the crossed-out old price beside it — and that is precisely the sign regulators look at. A price tag may advertise, but it may not claim what is not true.
2The 30-day rule: where discounts become a legal matter
Anyone announcing a price reduction in Germany must state the lowest total price of the previous 30 days and calculate the reduction against it (§ 11 Preisangabenverordnung, in this form since 28 May 2022; evidence level: law). The rule is simple — its consequences in continuous operation are not:
- Permanent discounts devalue themselves. Keep the price permanently low while advertising against an old regular price and you advertise against a price that did not exist in the last 30 days.
- Chained promotions run dry. Two promotions in quick succession each measure against the previous month's lowest price — the second necessarily advertises a smaller saving.
- You are responsible. Even though Amazon renders the display, the price statement remains your duty — as with all mandatory information (Listing L15).
How professionals handle it: promotions need spacing. A clean rhythm with at least 30 days at the regular price between promotions keeps the savings display truthful and buyer expectations stable. Permanently on offer means you no longer have a promotional price, you have a new regular price.
Leaving the original list price in place as a strike-through while the real selling price has been below it for months. That is the classic legal exposure: the advertised saving refers to a price at which nothing was sold in the last 30 days. Correcting it takes a minute; the warning letter costs four figures.
3The promotion types compared honestly
| Type | Visibility | Cost | Good for |
|---|---|---|---|
| Coupon | Green badge in search and on the page — the strongest click effect per discount point | The discount plus a fee per redemption (check the amount in your own account) | Lifting click-through without lowering the price permanently |
| Promotion (price discount) | On the detail page, less visible in search | The discount only | Clearing stock, running price tests |
| Prime exclusive discount | Badge for Prime members | The discount, sometimes a fee | Reaching the strongest buying group without lowering the price for everyone |
| Lightning deal / Best Deal | Very high — dedicated placements, urgency display | A variable fee, capped in Germany at €300 since 15 December 2025 (evidence level: Amazon) | Revenue peaks, a ranking push, fast stock clearance |
| Quantity discount / tiers | On the detail page | The discount only | Raising order value where multi-buy is plausible |
The key distinction is not cost but direction of effect: coupons and deals act on the CLICK rate (a badge in search), pure price cuts act on the CONVERSION rate (the price on the page). Cut the price when you have a click problem and you lose margin without touching the problem — the diagnosis for that comes from lesson 2.
The AURELO set sits at €24.99 and sells 19 units a day. Two ways to lift revenue: cut the price to €21.99, or run a 12 % coupon at an unchanged price. The price cut hits every buyer — €3 less contribution times 19 units, so €57 a day gone before a single extra unit is sold. The coupon acts first on click-through: more visitors reach the page at all, and the discount only costs on redemption. With a click problem the coupon almost always wins; with a conversion problem the price does. So the order is not taste, it is diagnosis.
4Measure elasticity instead of claiming it
Price elasticity says by what percentage volume rises when the price falls by one percent. It is in no report — you measure it yourself, and cleanly:
- Two price levels, at least two full weeks each. Shorter does not work: weekday patterns and demand swings need whole weeks.
- Only the price changes. No new advertising, no image change, no parallel coupon — otherwise you measure a blend.
- Do not test across a seasonal boundary. December answers no question that holds in March.
- Compare volume AND contribution, not revenue. Revenue rises a little with almost any price cut — that is the trap.
The result is a single number, but a valuable one: if volume rises by less than roughly the percentage you need for break-even (see the expert chapter), the cut was a loss-maker, however pretty the unit counts look.
5Automated repricing: what it may do
Repricing makes sense when several sellers offer the same ASIN, and is dangerous when rules are missing. Four boundaries belong in place before the first automation:
- A hard floor from your own costing, not from the competition. The floor is the price at which your contribution hits zero — below it you sell for Amazon, not for yourself.
- No reaction to unserious offers. A seller with no stock undercutting by €3 otherwise drags your whole price level down — and then disappears.
- No race against yourself. Running the same product on several accounts or in several countries lets automation undercut you.
- A change log. Without one a price collapse cannot be reconstructed — and the search for causes starts at ranking and advertising instead of at the repricer.
- Price floor per ASIN calculated from your costing and stored.
- Reference price checked against the actual price history of the last 30 days.
- At least 30 days at the regular price planned between promotions.
- Promotion type chosen by diagnosis: click problem → coupon, conversion problem → price.
- Break-even extra volume calculated before every discount.
- Elasticity test set up cleanly: two levels, two weeks, one change only.
- Repricer with a hard floor and a log, not with competitive rules alone.
6Expert insight: the discount calculation — how much extra volume a discount must carry
Exactly one question comes before every discount: how much more do I have to sell so that I am no worse off afterwards than before? The answer is a formula, and it surprises nearly everyone who runs it for the first time.
Required extra volume in percent = discount divided by (contribution per unit minus discount), times 100.
| AURELO starting point | Value |
|---|---|
| Selling price | €24.99 |
| Contribution per unit (after all costs) | €8.20 |
| 10 % discount = €2.50 | new contribution €5.70 |
| Extra volume required | 2.50 ÷ 5.70 = 44 % |
| 20 % discount = €5.00 | new contribution €3.20 |
| Extra volume required | 5.00 ÷ 3.20 = 156 % |
So ten percent off needs almost half as much volume again; twenty percent needs more than two and a half times. Three conclusions follow that few guides draw:
- The thinner the margin, the more brutal the curve. With €5 contribution and a €2.50 discount you need a doubling. That is exactly why discounts in low-margin niches are nearly always loss-making — and exactly where they are handed out most often.
- The benchmark is contribution, not revenue. Revenue nearly always rises; the question is whether more is left at month end. Celebrating revenue after a promotion means you looked rather than calculated.
- The ranking effect is an argument, not a blank cheque. Extra sales do feed visibility (Growth L3). That justifies a deliberately loss-making promotion — but only if you plan it as an investment, with an amount you are willing to lose and a measurement afterwards.
Two additions make the maths practical. First, the hangover: after a strong promotion, volume falls below normal for several days — buyers pulled forward what they would have bought later. Leave the following week out and you systematically overestimate every promotion. Second, the expectation effect: discount monthly and you train your buyers to wait. The damage is not the individual promotion but the regular price nobody buys at afterwards — and unlike a discount, that cannot be taken back.
The AURELO promotion at 20 % over seven days sells 41 units a day instead of 19 — a rise of 116 %. It feels like success and is still a loss: 156 % would have been needed. Concretely: €156 daily contribution before (19 × €8.20), €131 during (41 × €3.20). In the week after, volume drops to 14 units because buyers pulled purchases forward — another five days at roughly €41 lost per day. Over two weeks the promotion cost close to €380. That calculation, not the revenue curve that looked splendid the same week, decides whether the ranking effect was worth the price.
Lightning deals and Best Deals add a variable fee on top of the discount maths. In Germany it has been capped at €300 since 15 December 2025 — the cap protects you from the extreme case, not from a bad promotion. Fold the fee INTO the discount before you work out the required extra volume: on small promotions it can effectively double the discount.
The pro track assumes the other three and repeats nothing from them. It opens once you have completed all three in full — every lesson quiz at 80 % or better, and every final quiz passed.
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Frequently asked
May I leave a reference price in place if it was genuine once?
No. What counts is the lowest total price of the last 30 days — a price from six months ago does not support the savings display. If you permanently sell below the list price you no longer have a reference price, you have a new regular price, and the display has to follow.
Are coupons really better than a price cut?
Not better, different. The coupon buys attention in the results list and only costs on redemption, but adds a fee per redemption. The price cut works on every visitor and costs on every unit. Which tool fits is decided by the funnel diagnosis, not by preference.
How often can I run promotions without ruining price perception?
As a rule of thumb: no more often than every six to eight weeks, with at least 30 days at the regular price between them. That keeps the savings display legally clean and stops buyers from waiting for the next promotion. Discount more often and eventually you only sell on offer — and the regular price is hard to win back.
The free Listing Check scores any ASIN from 0 to 100 in a minute — the fastest way to see whether the mechanics from this lesson actually hold on your own listing.
Go deeper: the complete guide to optimizing Amazon listings →
Everything in this academy comes from day-to-day selling practice — the same playbook behind Listimo, the tool that turns product photos into complete Amazon listings.