I'd appreciate it if someone could explain to me how daily ranking works exactly. I' ve just realized that despite infastructure upgrades and military production, there are some days that my ranking remains stable or even worse, decreases a few points. At the same time, a friend of mine who is not that active in terms of upgrades has better ranking than me. Why is that? Just for the record, there are no shortages and generally speaking I handle economy very well.