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: