I know a young man who was offered a job. He hadn’t been job hunting, mind you. He already had a job. No, he was approached. And when they told him the salary, he said, “I think I should get 10 grand more a year.” And they gave it to him. He works there still.
What blows me away is that it would have never occurred to me to tell a potential employer that I was worth 10 grand more a year. Even if I believed I deserved it, the thought of asking would never have crossed my mind. I was never taught that such a possibility existed.
I think that is what separates the wheat from the chaff of humanity. Some people are taught to expect, even demand, opportunities. The rest of us are taught to keep our heads down and be grateful for whatever it is we happen to get.
Women, minorities, the underprivileged, none of us are taught to ask for 10 grand more out of life. None of us are taught that we have negotiable value. And most of us don’t even realize that there’s another way to be.
It kind of makes you wonder what other opportunities never get presented to us, simply because we don’t think to ask.
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The View from a Drawbridge 
I wonder how many other employers turned down that fellow before he found one who took him on. I wonder how many jobs he took w/o asking for more.
Good points. But in this case, the answers are not many and not many.