AntiTrumpAlliance

It's mostly beans. They're about a dollar per pound dry, which is approximately 1,500 calories, so a grown man needs just $1.50 per day to supply his calorie needs while getting a decent amount of protein. Other dry bulk goods (rice, flour, etc.) are comparable in price, have less protein overall, but supply specific amino acids that beans don't provide much of. Relatively cheap vegetables (sweet potatoes, carrots, cabbage, etc.) can provide vitamins but I would still take a vitamin supplement if I were on this diet, at least because since it's vegan there is no B12. People who eat meat will have an easier time.