Yes and no, that number is not overhead. Rather it is the cost of pay, insurance, vacation, pension and whatever else Detroit paid that was part of a worker’s package.
That's all GM claimed the $73 number was about.
If your objective is to figure out if your company has enough lawyers (as employees or on retainers) you will take a look at their won/loss record, and total net cost per suit.
After all, you can always throw another lawyer on the case and increase your probability of winning ~ but all that happens when you add another production line worker is you get an increase in costs.
It's how you line up the production line people and their machines that improves your bottom line.
At GM all those lawyers and marketing people were, it turns out, overhead and the average cost per production line workhour could have been lowered by firing the lawyers and marketers.