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Attitude
Attitude is used to determine the hostility of otherwise non-aggressive Non-Player Characters and the prices they'll accept when trading. Attacking a character, stealing, or interacting with objects without permission may cause a nearby character to lose attitude towards the offending character. The only way to increase attitude is to gift gold or items of value.
Maximizing trader attitude
It can be a good idea to maximize the attitude of certain traders as early in the game as possible, if they reappear in later acts and offer very expensive items.
As of Patch 5, the best way to improve trader attitude seems to be gifting coins rather than items. This is because gifting an item is equivalent to gifting that item's current sell price. If you reach attitude 100 by gifting coins, then sell the items you would have gifted, you will get better value out of those items.