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Some areas of 'pure' maths can be applied to economy (quite a bit of maths is still called pure but has lots of applications), but Maths at university has both pure and applied maths in the course

If you call the economy pointless, and encryption of things such as your personal information and bank details pointless, then yes.

Still at school, in Year 13 (for those who don't go by that system, last year before uni) going to study maths at uni