If you're interested in grocery store economics, I strongly recommend: The Secret Life of Groceries: The Dark Miracle of the American Supermarket by Benjamin L

If you're interested in grocery store economics, I strongly recommend: The Secret Life of Groceries: The Dark Miracle of the American Supermarket by Benjamin Lorr, and Grocery: The Buying and Selling of Food in America by Michael Ruhlman Extremely insightful about how much it cost to run a grocery store, where profits go, who the food suppliers really are, etc. Very eyeopening.