Seconded. Blindly implying that economists of all groups are blatantly appropriating math from other fields without understanding it seems a step too far to me.

Seconded. Blindly implying that economists of all groups are blatantly appropriating math from other fields without understanding it seems a step too far to me. I'm sure it happens, but I've worked in conjunction with people writing computer models to study certain economic subsystems and virtually everybody involved had a serious academic background in mathematics.