How many shoppers break the “10 items or less” limit in the supermarket?
A total of 68 15-min. observations of customers’ behavior at a food supermarket suggests that only about 7% of shoppers observe the item limit of the express lane. The averages tended to be about four pieces.
This is from Richard Wiseman’s very interesting book Quirkology: How We Discover the Big Truths in Small Things. If you liked Freakonomics, you’ll enjoy it.
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