There is really no economic structure in Zaiin as sales are made primarily in secret at black markets throughout the territory. All of the races abide here, both high and low.
The only official history that Zaiin has is that years ago it's ruler was slain by a rogue soldier, and since then order has failed to be restored. Throughout time, outlaws and criminals have fled here, safe from judgement in the other territories.
There is hardly a man you will run into that isn't a criminal of some sorts. The population is always in civil war, a constant battle between leaders of black markets vying for power.