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How do you tell other women to stay away from your husband without saying a word? Carry a really expensive purse!

A study out of the University of Minnesota discovered that carrying luxury items sends a signal to other women that you're in a committed relationship with your husband or boyfriend.

The theory goes like this -- wearing expensive brands means you have a more devoted husband and other women are less likely to flirt with him.

They also discovered that women desire more expensive items when they feel their relationship is in jeopardy.

Maybe this is why that Ashley Madison study discovered that cheating wives' love to shop at Banana Republic?