I have a question for those who are cognisant with the study of economics. I've heard in economic classes they teach all sorts of mathematical models to describe/predict all the "laws" in the field, or at least approximations. I'm trying to hunt down the popular and useful economics mathematical equations (I haven't taken an economics class before, but am very curious about the popular models). For those who are familiar with these economic mathematical models, mind sharing the knowledge with da PhysicsForums buddies? I like conceptualizing cause-effect systems ideas.