Gloriously Eat Grass for the Dear Leader!
I am actually a little surpised that the food made it to the black market. The army takes it - and from what I've seen the army isn't getting enough food, either. Perhaps conditions are better in some corps areas than in others. Or, if things in that area aren't better, maybe a senior officer diverted it for cash... but that's still problematic, because theft by soldiers, who have guns of course, has become endemic.
Maybe these black marketeers are heavily armed, too? That would be interesting.