I have a math undergrad. I imagine someone who values physics & econ wouldn't think a math degree is "societally unproductive", but the decided majority of peop

I have a math undergrad. I imagine someone who values physics & econ wouldn't think a math degree is "societally unproductive", but the decided majority of people I meet including other college graduates have absolutely no idea what I studied/learned in the course of doing that. What reason do you have to believe that you aren't doing the same thing with the majors you're judging societally unproductive?