The following illustration is attributed to the famous economist Milton Friedman:
Pencils are among the simplest of manufactured objects, but could you make them yourself?
You'd have to have your own forest, cut down the trees, transport them to a mill which makes the trees into pencil shapes.
Then you'd have to mine graphite to get the pencil lead, have a factory to sinter it with clay into a composite and yet another process to insert the lead into the pencil.
Then you'd have to have a rubber tree farm, and a factory that processes the latex, ovens to vulcanize it into usable rubber, then a machine to stamp the rubber into little erasers.
Then, you'd need a copper mine, plus a factory to smelt the copper, machinery to roll it into sheets, then another machine to shear the sheets into those little metal sleeves to hold the eraser in place.
Then, you'd need a paint factory to create the yellow paint to coat the wood of the pencil, plus a rig to spray the wood. Then you'd need another machine to crimp the copper band to the pencil and eraser.
And yet, a pencil costs 10 cents.