All good management is the expression of one great idea
The easiest way of making money is to stop losing it.
In getting good results team leaders become conductor rather than driver, enabling others to play the right music, not by hands-on domination of all decisions and execution, but by providing inspiration, motivation and stimulus.
Either an executive can do his job or he can't.
If sophisticated calculations are needed to justify an action, don't do it.
Most people don't manage to the utmost of their ability because they don't want to.