Junk food ranges from 100 Calories per dollar to 300 calories per dollar.
There arent junk foods that score above 400 calories per dollar. They dont exist from 5 years of searching(and if they do, let me know, I would like to study it).
Those corner stores will have Apples, Oranges, and Bananas. There is a reason, they are cheap and similar cost to these junk foods.
> small corner market in a poor neighborhood, which is often the only market a poor person has access to, the veggies are far more expensive per calorie than junco food
This seems like an impossibility. Junk food requires a multiple stage manufacturing process, while vegetables only need to be shipped and sometimes refrigerated.
The big thing is to look at the price you pay. Paying 1 dollar for a bag of carrots is cheaper than a 15 dollar tray of mixed veggies.
As previously mentioned, if you have ideas for low cost foods, let me know, we study this for Efficiency Is Everything.