Managements, you know, often think of themselves.
I agree with Warren to keep it simple and not use higher mathematics in your analysis.
If you are honest, hardworking, reasonably intelligent and have good common sense, you can do well in the investment field as long as you are not too greedy and don't get too emotional when things go against you.
Be sure that debt does not exceed 100% of the equity.
You have to have confidence in what you're doing.
Buy stocks where the outlook is not good.