here is a dandy I found a while back, kind of explains it better...............................................
That reminds me about the old Texan who had been trying to retire for years. He'd been working as a engineer in the industrial machining field for 40 years had seen all the generations of machinery come and go, had a hand in creating some of them.
He was bored with it all and wanted to quit working for somebody else so he decided when the opportunity was right he would just quit and become a consultant.
A few months later he quit his job and relaxed, starting playing golf and decided he was liking this retirement thing.
One day he got a frantic phone call from a company that was having problems with their manufacturing line. One of their most important machines was down and it was costing them $2000 an hour for every hour it was down.
He negotiated a deal to come out and look at it. $5000 up front, 1st class ticket and pay his expenses and he could be on a plane that afternoon and be on the line by midnight that night.
The panicked executive agreed, just crying get this thing up and running, we don't have anybody here who has been able to figure this thing out and we need this thing running!
To make a long story short the engineer/consultant shows up at the plant, sniffs around the machine for a few hours and narrows down the problem. The executive says, "Well, what do we need to do?". The savvy old man says, it's gonna cost you $30,000 and I can have the machine up and running by 11:00 am next morning.
The executive says, done. The old engineer makes a phone call and gets a $200.00 part over nighted to the factory on schedule for a 9:00am delivery the next day.
By 10:30 the old engineer has the line up and running and he goes to the executives office to collect his check.
The executive is angry, he says, $^*? All this took was a $200 part? We thought something drastic was wrong with the machine, how can you accept a $30,000.00 pay check for 1 nights worth of work?
The savvy old engineer hands him his invoice and says, don't worry, I broke it all out for you on my invoice so it would all make sense to you.
The executive looks at the invoice, it says
Knowledge to know which one was broken $29,800.00
The executive wrote him the check.