Job gains in the middle of the wage distribution

For at least two decades the data have shown a hollowing out of jobs in the middle of the wage distribution.  Job growth has been concentrated in the two extremes: the high end and the low end.

But that trend may be coming to an end.  Today's WP has a short article summarizing research by the New York Fed on job growth by wage tiers.  There was much more job growth in middle-wage jobs between 2013 and 2015 than there was in the low and high wage tiers.  Industries such as construction, education and transportation led the way.