What each discount type actually buys
| Promotion | What it buys | Best used when |
|---|---|---|
| Coupon | Click-through from the search page badge | Traffic is fine but click share is weak |
| Lightning Deal | A short velocity spike and deal-page traffic | Launch push, rank push, or clearance |
| Best Deal | Sustained visibility over a longer window | Seasonal peaks and category events |
| Prime Exclusive Discount | Conversion from high-intent Prime shoppers | You need conversion without a public price cut |
| Subscribe & Save | Repeat purchase and predictable demand | Consumables and replenishable products |
The math that decides it
A promotion pays back when the incremental margin from added units, plus the durable value of the rank or subscriber base it creates, exceeds the margin given away on units that would have sold anyway. That last part is where most promotion plans fail: a large share of discounted units are cannibalized full-price sales.
Model it simply. Take your baseline daily units, estimate the promoted daily units, and calculate margin under both scenarios. If promoted total margin is lower, you are buying rank or reviews rather than profit, which is a legitimate choice only when you have named the goal in advance.
- Always calculate against contribution margin after referral, fulfillment, and ad cost
- Set a hard floor price and never let a deal approve below it
- Watch your price history: repeated deep discounts reset shopper reference price
- Never stack a coupon on top of a deal without re-running the floor calculation
Sequencing promotions with advertising
A discount raises conversion rate, which lowers effective cost per acquisition on the same ad spend. That means the highest-return moment to increase advertising is during a promotion, not before it.
The pattern we use: raise bids on high-intent branded and category terms for the promotion window, keep discovery campaigns flat, then hold the higher bids for several days after the promotion ends so the improved conversion history carries into organic rank rather than evaporating.
The four mistakes that make promotions unprofitable
- Running a deal on a listing that is not conversion-ready, which spends velocity on a page that cannot hold it
- Discounting a SKU that is already inventory-constrained, which creates a stockout right after the rank gain
- Treating Subscribe & Save as a discount rather than a retention program, and never measuring second-order rate
- Repeating the same discount monthly until shoppers simply wait for it
