And if you have a traditional economic system and it's based on agriculture and then you have some problems, like for instance, let's say that you don't have enough water for your crops. You know, Mesoamerica, they developed irrigation systems. Or you don't have good transport in your economic system, you have to build roads. Or they had floating islands that were landlocked by, I think, anchors. I forget what the term is. It's like a mesomanin or something like that. But it's the idea that they adopted so their economic system worked for them.