This week, Marketplace, a busness series on National Public Radio, is exploring this same topic. They are getting some really good essays from some really interesting sources. Check it out: here
There is a link to the previous essay on that page. If the rest of the week is as good as these two, I might have to work harder to keep up. I am going to call this research and continue my post when it's over. Evelyn Dortch makes one of the points I was going to make about the distance between those bottom rungs of the ladder and the next ones above them, and also how easy it is to slip downward. I'll share my thoughts on how this is achieved soon.