I find that economics is drenched in maths, depending on the school. Take Chicago's undergraduate program, for example[0]. It requires calculus classes before you even get to the starting line for the economics classes, and they encourage students to go further: "Students who have an interest in the major should take calculus at the highest level for which they qualify."

[0] http://collegecatalog.uchicago.edu/thecollege/economics/#Fun...