You know, how in HoI4 the ´counters´ for the units will merge, when you zoom out? Assuming there will be some sort of ressource-mapmode, it should behave just like that, too, so that when you zoom out, you will be able to see the Ressources/IC of whole regions (in a none-gameterm sense) at once. Zoom out far enough and the ´counters´ will stand for whole nations.