There must be a feature in age of empires future game. It must be like As citizen gather resources a part of it will be automatically converted to gold. It must have resource cap too, like 10 % gold if you produce 200 food/stone/wood a minute, if you produce 400 a minute from your farms its converted to a max of 35 gold not beyond that. It must be researched in the market as technology advancement. So that we do not get resource penalty.