The "Salary Theorem" states that "Engineers and scientists can never earn as much as business executives and sales people."
This theorem can now be supported by a mathematical equation based on the following two postulates:
Knowledge is Power. (1)
Time is Money. (2)
As every engineer knows: 
Power = Work / Time (3)
Substituting (1) and (2) in (3), we get
Knowledge = Work/Money.
Solving for Money:
Money = Work / Knowledge.
Thus, as Knowledge approaches zero, Money approaches infinity,
regardless of the amount of work done.
Conclusion: The less you know, the more you make.