Amazon's auto-replenishment program. Customers subscribe to repeat orders and receive a discount; the seller gets recurring revenue and predictable LTV.
ExampleA protein powder buyer subscribes to a monthly delivery and gets 10% off. The seller's LTV on that customer triples over 18 months.
Subscribe and Save is the highest-LTV lever on Amazon for any consumable. Beauty, supplements, household goods, pet food, baby - any product with a regular use cycle benefits.
The discount is funded partly by Amazon and partly by the seller, but the LTV lift more than offsets the give-away. Modeling S&S correctly changes the maximum ad spend you can justify on a first-time buyer.
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