1) traders might be attacked by other civilizations and looters
2) They may disagree upon the pricing and the worth of traded items
3) One may want to get rid of a item, another may not want to buy it, resulting in hatred and eventually war if it becomes too 'aggressive'
hope this helps
<span>I am learning right now the new upgrades to Gods and Kings with one in particular. After you build the Oracle you are asked if your Great Person should visit it or just start culcture bomb or golden age. What is the advantage of going to the Oracle and do you just need to be one move next to it. Had difficulty getting my Great Person to explore the Oracle.</span>
What is on diagram 2? Do you have a photo up here, because if you do, it won’t load.
