Who's the Job Creator?
See also Nicholas Kristof on “The Value of Teachers” (both via Wisconsin Forward):
What shone through the [Chetty, Friedman, and Rockoff] study was the variation among teachers. Great teachers not only raised test scores significantly — an effect that mostly faded within a few years — but also left their students with better life outcomes. A great teacher (defined as one better than 84 percent of peers) for a single year between fourth and eighth grades resulted in students earning almost 1 percent more at age 28.