>be me
>taking an econ course in uni
>do notes on an entire chapter
>it's saying "when labor is cheaper than capital you lower costs by using more labor, when capital is cheaper than labor you lower costs by using more capital"
>this literally gets pages and pages of treatment and explanation, including like a dozen charts and five different math formulas
All you'd need to understand this concept is a simple once sentence explanation, and a math formula that shows you how to find the optimal quantities of both inputs. it doesn't need like multiple formulas, and it's not complicated enough that any charts would be necessary to understand the concept.