Around 10 minutes in, they discuss why the price/unit of aircraft fell between "kitty hawk and WW2", whereas it has increased exponentially since then. The act

Around 10 minutes in, they discuss why the price/unit of aircraft fell between "kitty hawk and WW2", whereas it has increased exponentially since then. The actual answer to this is "target" monetary inflation. That is, increasing the money supply at a slightly faster rate than the increase in productivity makes prices rise at a fixed pace.