Neville, many years ago I knew of a pharmacy that had two stores, one in an inner city area and one in a suburb. Guess which one had the bigger shoplifting problem?
Lakewhut, I find cashiers are usually faster at scanning than are self-checkout customers. It just makes sense, since they’re doing it several hours a day as opposed to a few minutes a week.
There are some items that you generally can’t buy in self-checkout lanes, e.g. gift cards.