Think before you act: it's not your money.
The first myth of management is that it exists.
Cash in must exceed cash out.
Either an executive can do his job or he can't.
If sophisticated calculations are needed to justify an action, don't do it.
Here lies one of the world's rare generalized TINAs. There Is No Alternative to creativity and innovation: these days, obscurantism and conservatism will do for you every time.