What went wrong??

My dad works at a GM factory and I used to work for one of there suppliers but now work building Toyota in a factory the one thing I can tell you is no matter how many guys building cars get laid off or how many shifts get cut back at a gm plant they still hire more supervisors and management staff I watched a plant go from 3 shift with almost 200 people to 120 people or less on 2 shifts and they hired 4 more people for management where my dad works they went from 1 supervisor for 3 shifts of maintenence in one department 20 years ago to 3 supervisors and a manger per shift with the same number of maintence people the companies are getting very top heavy that is one of the reasons toyota is doing better then the big three they replace people not add to hopefully it stays that way the gm plant my dad works in continues expanding the office even though the number of line workers is shrinking Ie. they went from 3 shifts to 1 shift and still hire management guys go figure