Think before you act: it's not your money.
No decision in business provides greater potential for the creation of wealth (or its destruction, come to think of it) than the choice of which innovation to back.
Cash in must exceed cash out.
If sophisticated calculations are needed to justify an action, don't do it.
Either an executive can do his job or he can't.
Most people don't manage to the utmost of their ability because they don't want to.