I remember watching A Faster Horse, a documentary on the Mustang. There was an interview with an accountant type at Ford who pointed out a three cent difference in part cost per car multiplied to millions of dollars at their scale. A $1 part might have given him a heart attack.
Seriously people need to watch Sandy Munro on YT. He literally went threw some calculations one the money you can save on removing a single fastner from the design.
He was a former chief engineer at Ford and had his own company for decades now. He also worked in Ford Global Finical Head Quarters.
When he sees some small board screwed down with to many screws he starts ranting.
