One of the fundamental and most memorable lessons in economics, regarding specialization and cooperation, is captured in Leonard Read’s 1958 essay, I, Pencil.
Milton Friedman also popularized the idea and the Competitve Enterprise Institute made a short film of the same name.
Today, my contribution to economic theory, the Kaminsky Corollary to I,Pencil:
No individual person can make a pencil, but a single puppy can destroy them with remarkable efficiency.
(Does this imply that a puppy is more powerful than all of mankind?)