Kroger knows every purchase you've ever made – and says it could make millions of dollars selling your data

• Grocers like Kroger are gathering consumer data and selling it, The Markup reported.
• Kroger says that selling the data to advertisers could help it realize $1 billion in new profit.
• But the information, even without names attached, could violate customers' privacy. 

Major grocers aren't just moving produce or TV dinners anymore: Many are also selling detailed information about customers' purchasing habits.