What is this “junk food is cheap” stuff. Have you priced that stuff in the store? $4.00 for a bag of potato chips is not cheap. For that I can buy and make a nice dinner of pork loin, rice and salad.
Oh sure there are expensive junk foods, but there is also some that is very cheap, and very calorific. And remember poor unemployed people dont burn up the calories because they tend not to be very active.