So when you have that build a big of an empire, you need to go beyond that traditional economic system because of the desire for goods, for different things. And that's that concept of scarcity again. So you really develop trade economic systems. And when you go to trade, then you have to develop, you know, new techniques to work that economic system. So maybe instead of bartering, you develop a money supply system or some type of way of doing it so I don't have to bring, you know, 15 pounds of gold on my back to pay you. Banking systems, insurance systems are all developed in that Middle Eastern world. And then you get a lot of cultural diffusion.