In-store slack: Consumers often plan for unplanned purchases

Straying from the grocery list can yield some surprises in your shopping cart, but not necessarily in your wallet, according to University of Pittsburgh researchers and a coresearcher from Baylor University who have coauthored a new study. The researchers found that shoppers often expect to buy a certain number of unplanned items, and most have a fairly accurate estimate as to how much they will spend on them. The study's coauthors use the term "in-store slack" to describe the room shoppers leave in their budget for unplanned purchases.

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