Reputation

The symbol for happiness or reputation is displayed with. For interactions to be available with NPCs, e.g. trading, asking favors, or entering houses, different reputation levels are needed. Reputation can be earned by completing quests.

Effect on base price
Items have a base price. Each vendor charges based on your level with them, amount of previous trading, and item demand. You are able to sell items above or below base price in relation to these factors.

One exception is the at a set price of.