Basket data analysis - is to analyze the association of purchased items in a single basket or single purchase as per the examples given above.
Cross marketing - is to work with other businesses that complement your own, not competitors. For example, vehicle dealerships and manufacturers have cross marketing campaigns with oil and gas companies for obvious reasons.
Catalog design - the selection of items in a business’ catalog are often designed to complement each other so that buying one item will lead to buying of another. So these items are often complements or very related.
