I am of course quoting from a famous essay by Leonard Read, the economist in the 1950s, called "I, Pencil" in which he wrote about how a pencil came to be made, and how nobody knows even how to make a pencil, because the people who assemble it don't know how to mine graphite, and they don't know how to fell trees and that kind of thing.
Em refereixo, evidentment, al famós assaig de Leonard Read, l'economista de la dècada de 1950, titulat "Jo, el llapis", on va escriure com es fabricava un llapis i afirmava que ni tan sols hi ha ningú que sàpiga fer-ne un, perquè els obrers que el munten no saben excavar el grafit. Ni saben talar els arbres, ni res de semblant.