https://www.youtube-nocookie.com/embed/VutgFfylwn0
Further reading:
Time and the Theory of Cost by Jeffrey M. Herbener (Chapter 6 in The Economic Theory of Costs: Foundations and New Directions)
Man, Economy, and State by Murray N. Rothbard (Chapters 5–9)
From Marshallian Partial Equilibrium to Austrian General Equilibrium by Patrick Newman
The DMVP-MVP Controversy: A Note by Walter Block
The Methodology of Profit Maximization: An Austrian Alternative by William L. Anderson & Ronald L. Ross
Rothbard on V Shaped Average and Total Cost Curves by William Barnett II & Walter Block