Creepy or convenient? Grocery store merger aims to improve 'personalized' shopping

Grocery shopping is something we all do, and it's highly personal. People have strong feelings about where and how they get their food. The proposed $25 billion merger of two of the nation's largest supermarket chains has the potential to affect how millions of customers buy their groceries. "State of the Cart" is a four-part series that examines different aspects of the proposed merger — its impact on consumers, on workers, on the communities themselves, and on our shopping habits.