Every week, I go onto Walmart’s website and order a bunch of groceries to be delivered to my house and then feel a little bit guilty. Walmart is a multi-billion dollar corporation with headquarters more than 1,000 miles from my home; the money I spend there goes to shareholders and executives who live far away, instead of to my local grocery store, Key Food, an 86-year-old co-op of independently owned stores based near my home in New York.