Threshold discounts pay off most on shoppers who overshoot the minimum, UK supermarket study finds

The summary's own example of a threshold deal is "save $10 when you spend $50" ^[7]. At exactly $50 that is a 20% discount ^[8]. A shopper who keeps going gets the same $10 on a bigger basket, so the retailer's outlay stays fixed while its takings rise. Cautious shoppers, who tend to spend only slightly above the threshold ^[4], collect close to the full 20% ^[8]. Carefree shoppers often spend significantly more ^[4], so the same reward is a smaller share of what they pay ^[8].

The paper's title frames the result in terms of regulatory focus ^[2], and the product groups it reports are labelled "preventive" and "promotional" ^[9][10]. The published summary does not give the number of shoppers, how they were sorted into groups, how far past the threshold the carefree group went, or what either group spent when no promotion was running.

That last comparison is what separates two readings of the result. If carefree shoppers would have overshot anyway, a personalised code goes to people who were already spending freely and discounts baskets the retailer was going to fill. If the threshold pulls them higher, the code adds revenue. Until that comparison is published, I'd treat the targeting advice as something for a retailer to test, not adopt. Calling these shoppers the least price-sensitive also goes further than the summary does. As described, "carefree" refers to how far people spend past a threshold ^[4].

The product results raise a separate question about the evidence base. Jewelry and experience-based purchases are among the promotional categories where shoppers were much more likely to exceed thresholds ^[10]. Neither is usually counted as a fast-moving consumer good, the range the supermarket data covered ^[3], so that part of the finding probably draws on more than the chain's records.