Starfield:Commerce

Commerce is automatically unlocked and can already be learned by using a skill point to learn it.

Backgrounds
This skill is automatically learned with the following backgrounds:
 * Diplomat

Skill Increases
The fastest way to quickly progress through the skill rank challenges would be to buy or sell 1 of each cheap item, such as food / ammo / misc. One could max this skill soon after arriving on New Atlantis by collecting lots of lightweight items and saving up previous skill points and / or choosing the Diplomat Background.