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.
Je cite bien sûr un célèbre essai de Leonard Reed, l'économiste dans les années 1950, intitulé "Moi, le Crayon" dans lequel il a écrit sur comment on arrivait à faire un crayon, et comment personne ne sait comment faire un crayon, parce que les gens qui l'assemblent ne savent pas comment extraire le graphite. Et ils ne savent pas comment abattre des arbres et ce genre de chose.