
 Originally Posted by 
Darth Ganon
					 
				 
				Jobs levels raise the proficiency of their weapons like more hits per attack, but I can't recall how deep the mechanics go.
I want to say that stat gains for base level ups are determined by job/job level, so in the case of a Black Mage MP (was there MP in FFIII?) and magic would go up more leading to more powerful spells. It's been so long since I played that somebody else more knowledgeable about the game should confirm or deny.
I've played FFV and Bravely Default since then, too, so I'm probably mixing up all sorts of things.