I'm not saying it doesn't exist. I'm saying that it isn't commonly used. Objectively, a great majority of people can live their lives without even thinking about or performing calculus outside of the classroom.

That is why I questioned whether knowing calculus is really a piece of fundamental knowledge that allows a 10x performance increase. For the majority of people it's not going to help them. Even if they deal with calculus in their field, I don't see it providing a 10x increase because unless one is mathematician, the calculus portion of their job will be inconsequential and likely be automated or computed for them.