Pretty bad once you reach the minioan age, wnd it's just as worse further up the tech tree in other ages, you require vast ammounts for upgrades, imagine this you need 1120 linen shirts just to be able to manufacture linen shirts and 1995 marble busts to be able to make marble busts... Did the devs just go all in for a cash grab? At the prices they have in the store you could buy whichever latest gen phone or tablet if you wanted just to get past the minoan age in this game...