““In observing the behavior of thousands of shoppers, letting shoppers group themselves according to behavior, we have identified three primary types of shoppers, as follows:2 • Quick: As noted previously, the number of products purchased most commonly on a shopping trip is one. These shoppers spend a short time in a small area, with a relatively slow walking speed but high spending speed. A third of all trips to the supermarket result in only one or two items being purchased, with fully half of all trips consisting of five or fewer items purchased. • Fill-in: These shoppers visit about a fifth of the store, have a slightly faster—but still slow—walking speed and an average spending speed. • Stock-up: These shoppers cover a larger area, walk more quickly, but have a lower spending speed.””