So we're going to look at two of those worlds and how they're going to both kind of transport themselves from traditional economic systems into more market-based economic systems. One of them would definitely be kind of the Middle East. And you're talking about maybe the Abbasid dynasty. So maybe 400, 500 years, 700 AD to like 1200 AD. It's a huge empire. I mean, that empire stretched basically from China almost all the way through Western Africa. 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.