The Mercantile skill will increase your market affinity.

Market Affinity is not defined by the game itself, but it is a very simple concept. Increasing your market affinity has two effects:

  • Customers who come in to buy an item will offer you more money.
  • Customers who come in to sell an item will demand less money. (note by doenen: many observations have been made that increasing Mercantile actually makes sellers ask for MORE money, not less.)

There are three known ways to increase your market affinity: