How to boost your economy with drop-shipping in Ancient China

Well you need to search for the guys with the following things:
Very Rich(gold) - Very Poor(food)
or
Very Poor(gold - Very Rich(food)

To see this open the diplomacy screen and just look and give them what they need and take what they don't. ez money ez food.

And this is how I make tons of money with Amaz- ehm 3K drop-shipping!

Yeah that's all actually. Hope it helps!