[StageAnalysis]

Looking for guidance as to what os the new GM?

Stan says.. "as gm goes..." and uses it as an indicator.

Apple?  IBM? Still gm?

Assuming that GM was the biggest stock at the time of the book being written in the 80s, I'd say these days it would be Apple as it has the biggest weighting of the S&P 500 stocks, and makes up almost 4% of it's moves.