The next time you’re shopping for groceries, leave your phone in your pocket. Or better yet, in your car.

Researchers at Babson College and the University of Tennessee recently looked at how our phones can affect the way we shop. And it turns out people who use their phone at the supermarket spend a LOT more on groceries than people who don’t.

The average person spent 41% more money when they used their phone while they shopped, to do things like check social media and respond to texts.

And each second they spent on their phone upped their final bill by 25 to 50 cents. So if you think of it like that, every four seconds on your phone costs you at least a buck.

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