i can't find the original one i used but here's an NPR article
http://www.npr.org/blogs/money/2012/03/ ... s-for-workand here's some BLS statistics
http://www.bls.gov/oes/current/area_emp ... _chart.htmother than RNs, none of those are skilled or would require more than a few months to learn.
and then let's just not be idiots and look at things like the household median income which, if i remember, is somewhere around 40,000 dollars. that number suggests unskilled service sector or the trades.