Modelling the global economy isn't rocket science?
As I think Carmack said, "Rocket science isn't rocket science".
Modelling the global (or even national) economy I think would class as hard enough to be "rocket science".
It's not just a matter of buying a big enough computer. You have to, like, write a program and shit.
Economics as a predictive science is a bunch of utter toss compared to, say, Newtonian dynamics. You can't just "simulate" it.
So no, it isn't rocket science, it's about a million times harder.
BTW, if you really don't know what it means to take a loglinear approximation around the steady state and solve it in MatLab just STFU on this topic.
BTW2, if you read Beer you'll see that there might be ways of modelling an entire economy on a computer, which aren't rocket science, but which will also run happily on a Dell.