bonnie
I play a nice person on twitter.
I think you would have to be in Passin's shoes to really know. But I would hope it's not the giant presses! Those are some big boy toys! My guess, and I remind you I know nothing about auto manufacturing, I would think it would be the assembly line itself. Where humans use tools to put it all together. Can not replace every process with a machine. Luckily for us humans....
I agree - but people can be added as the line grows. Eventually, though, there will be a current constraint that dictates more equipment be added. I think the paint is a likely candidate.