Buying a caravan or archer doesn't work into my tech path...i start pottery,writing,mining,calander...then archer/animal husbandary. Taking mining early gives my cities enough production to hard build units and building,in mind cant justify spending gold on something i can have in a few turns of patience. So i start using my cash to court cs friendships/alliances. Also i dont know if im just lucky but more times than not my first scout hits a upgrade ruin so i have an archer and have found a archer warrior combo enough to hold for awhile. So maybe i should re-think my starting tech path to grab trade quicker??