You might think that browsing slowly through the store would help you pick out the best products. But our research shows that's not the case.
The shoppers I studied who took the longest, examining packages, stopping at whatever caught their eye, invariably spent more money. They tumbled stray, often unhealthy, items into their baskets, and later, when questioned, couldn't cite a reason for the purchases.
It turns out that making up a precise list beforehand and getting the errand done as quickly as possible is the best way to save money.