Why study math
There are no jobs called "mathematician", however...
Mathematicians have always been leaders of technologies and innovation. Jobs in new market segments are usually occupied by mathematicians: Programmers, economic analysts, cyber-security experts, quants, bioinformatics experts, ... Too many people study for proffesions that the labour market no longer needs by the time of their graduation. This will never happen to mathematics due to its universality and potential for innovation. Gilbert Keith Chesterton once said:
"It is not that they cannot see the solution. It is that they cannot see the problem."