Al, yes MC and PE ratios must be considered when investing a company.
You posted this recently...
"Coal really interested me, thought $25/tonne profit (conservative) x 1million tonnes per year x PE 5 = 125mill MC.
Divide by 2 to be safe 60mill MC.
Divide by 80mill shares and options = 75c
I'm not a coal expert so study up a bit before using that equation. :)"