Calculus is pretty basic and if you wanna do useful economics you need calculus to some extent (and many marxist economists use calculus) but usually when economists use stuff more "advanced" than calculus they only do it because they think it makes them more "serious" than they really are, and it helps obscure their dumb premises.
A good analogy would be using precision lasers to make extremely fine measurements to perfectly align a square peg with a round hole.
Economics is a false discipline. It's a subset of Politics, political economy. No calculus or higher math required. Fight me.
Calculus is pretty basic and if you wanna do useful economics you need calculus to some extent (and many marxist economists use calculus) but usually when economists use stuff more "advanced" than calculus they only do it because they think it makes them more "serious" than they really are, and it helps obscure their dumb premises.
A good analogy would be using precision lasers to make extremely fine measurements to perfectly align a square peg with a round hole.
Economics is astrology for men
Just read literally any modern research paper in Marxian economics