“These are long-term trends that began decades ago, says David Autor, an MIT economist who has studied ‘job polarization’—the disappearance of middle-skill jobs even as demand increases for low-paying manual work on the one hand and highly skilled work on the other. This ‘hollowing out’ of ­the middle of the workforce, he says, ‘has been going on for a while.’ Nevertheless, the recession of 2007–2009 may have sped up the destruction of many relatively well-paid jobs requiring repetitive tasks that can be automated.” Read more