Cross sell second category: what single-category members buy next
The short answer
To choose a cross sell second category for single-category members, look at members who started in the same category and later added another. Rank second categories by how often they were chosen and by 12-month spend after the addition, then lead with the one that scores well on both.
Why it matters
Members who buy across two categories have more reasons to come back than those who stick to one. Leading with the right second category turns a narrow member into a broader one, while the wrong one wastes the offer and the member's attention.
The question to ask
Copy this into Lexi as written.
What the answer looks like
Illustrative output on sample data
Illustrative example: how Lexi answers this for an outdoor retailer with 22,000 members who have only bought hiking footwear. It looks at what similar members added as a second category.
- Socks and accessories: 46% of additions, $160 extra 12-month spend
- Rain jackets: 28%, $290
- Backpacks: 26%, $340
What the data shows
Socks are the easiest add-on, but backpack and rain jacket buyers spend about twice as much afterward.
What it means
Members who added a backpack were often planning trips, and many went on to buy camping gear.
What to do
Lead with backpacks for members who bought a technical boot, and socks for the rest.
Want me to build both groups as segments?
Frequently asked questions
How do I predict the next category a customer will buy?
Look at customers who started in the same place and see what they bought second, how often and how soon. Weight those paths by what customers spent afterward. For individual customers, add their own browsing and email clicks to refine which category is most likely next.
Should every single-category member get the same cross-sell offer?
No. Members who started with the same category can be very different, such as a casual walker and a long-distance hiker buying the same boot. Splitting them by what they bought, its price and their other signals lets each group see the second category that fits them.
When should a second-category offer go out?
Within the usual gap between a member's first and second purchases, while the first product is still in use. For seasonal categories, time it to the start of the relevant season. Test timing on part of the group to find when members respond best.