I offered an extra copy of luxury to my ally, Vicky, and she gladly replies with an offer of 3 gold per turn. That little sum of gold was soooo unimportant for me thus I rejected. And then when I ask for one extra copy of her luxuries, she asked for 29 gold per turn. me: What?! Then I bargained with her, adding my extra luxury to the offer. Vicky: 25 gold per turn and a copy of your iron. You are always kind and attentive. me: N-o no. Afterwards, Pedro came to ask for the same copy of luxury. He just denounced me and surely we were in no good shape of engaging a trade. And he offered me 5 gold per turn, a copy of his luxury and open border..... I am really puzzled about the AI's trading logic. It is neither based on diplomatic relationships, nor the pre-set price of a luxury/resources, like in V. At least I know a luxury worths approximately 8 gold per turn in V. Thats why I normally give up on trading and used those luxuries purely as gifts. Do any of you have any idea to predict their trends?