Cross-sell
A commercial technique that offers existing customers products or services complementary to those they already use. Unlike upselling — which moves a customer to a higher tier of the same product — cross-selling broadens the basket with new categories.
In practice
Amazon has calculated that cross-selling ('customers who bought this also bought') generates approximately 35 percent of its revenue. In B2B SaaS, cross-selling relies on a complementary product map and knowledge of the customer’s maturity stage. The prerequisite for success is a sufficiently positive experience with the first product — cross-selling cannot compensate for dissatisfaction.