from the Federal Reserve Bank of Dallas
Employment in the United States is becoming increasingly polarized, growing ever more concentrated in the highest – and lowest – paying occupations and creating growing income inequality. The causes and consequences of this trend are often considered in the context of what has been a relatively “jobless” recovery from the Great Recession. The number of people performing low-skill, low-pay, manual labor tasks has grown along with the number undertaking high-skill, high-pay, nonroutine, principally problem solving jobs.
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Source: http://dallasfed.org/assets/documents/research/eclett/2014/el1405.pdf