Mercantile

Mercantile is a skill that lets the character make better deals when buying items from merchants or selling items to them.

Mechanic
The amount of gold the character gets for selling items is increased by 2.5% of the item's base value per skill level. The price they pay when buying items is reduced by 3.5% of the item's base value per skill level. The prices can be calculated with the folling formulas:

Selling price = Item value - (0.5 - 0.025 * Mercantile skill level) * Item value Buying Price = Item value + (1.0 - 0.035 * Mercantile skill level) * Item value

At Mercantile skill level 20, the character can buy items for their actual value. At level 25, they can buy and sell items for the same price. At level 26 and above, they sell items for more than what they buy them for, and can make money by buying and selling the same items repeatedly. At level 58 and above, items cost a negative amount - the character actually gets paid to take them.

Mercantile also affects repair costs, but not the cost of skill training.

Skill books

 * Buying and Selling (Book I)
 * The War of Mercantilism (Book II and Book III)

Trainers

 * Leisle (Book III)