I never used Ibans rpg, so i wouldnt know if this is ibans. All i know is i never seen a city rpg like this.
It had events call "sellfood" you can sell food choose how much profit you want from it. It is a pretty decent system. There wouldnt be a way to have infinite free food either. It has a sellfood event. This isnt your rpg where players sell items, the players events sell items.