Suppose that in Problem S11-19 Atlantic could purchase all the baby food it needs from a New York City distributor at a price that would result in a profit of $9 per case at stores 1, 3, and 4, $8 per case at stores 2 and 6, and $7 per case at store 5. Should Atlantic purchase all, none, or some of its baby food from the distributor rather than purchasing it at other stores and trucking it in?