I like this idea, but finding the balance between nation size to resource production ratio would be hard to achieve if it were to not greatly disrupt the market. If it were well planned one could simply swap around a few numbers and nations would be making the same amount of money with lower ppu just by having a greater excess of material. It also allows for faster growth of smaller nations, as not as much needs to be bought in but with the dropped prices they could grow a whole lot faster. The downside to that is that smaller nations would find it harder to make as much money on the market, but the saving could easily counteract that. All in all I think this is something that has potential