I'm more interested in the education vs. income vs. prestige graph in: http://blogs.forbes.com/smcnally/2010/11/10/names-you-need-to-know-in-2011-r-data-analysi

I'm more interested in the education vs. income vs. prestige graph in: http://blogs.forbes.com/smcnally/2010/11/10/names-you-need-to-know-in-2011-r-data-analysis-software/ http://blogs.forbes.com/smcnally/2010/11/10/names-you-need-t... Looks like there might be a ceiling for prestige, and that income is not as related to it as I would have thought. But, what are the units?