I think there is a fundamental problem that, because economics arose from accountancy, that it is science founded on mathematical principles.

It isn't. It's not a science at all, dismal or otherwise, it's opinion-based arithmetic.  

The mathematics of sciences are all derivable from first principle primary forces. They are inter-related, testable and repeatable.

No such science exists in economics. An idea of how the world works arises, data is selected to test this idea (and others rejected), trends within that data are selectively measured, statistically analyzed and, surprise surprise, actually reflect the opinion first expressed. Indeed, minor deviations of the selected data from the opinion are cited as proof of scientific rigor.

No, it's not. It's the description of a flat earth resting on the backs of four elephants who, in turn, stand upon the back of a giant, space-faring turtle climbing unsupported upon their own back to reach a conclusion.

keep to the Fen Causeway