“Many of the middle-skill jobs that persist in the future will combine routine technical tasks with the set of non-routine tasks in which workers hold comparative advantage — interpersonal interaction, flexibility, adaptability and problem-solving,” Mr. Autor writes. He specifically mentions medical support jobs, building trades and some clerical jobs that require decision-making rather than typing and filing.In the paper, Mr. Autor presents data showing that these middle-skill jobs have indeed been under pressure over the last few decades, with much stronger growth in the number of both very basic low-paying jobs and the most advanced jobs for skilled professionals. It is a hollowing-out of the American work force, in effect, with fewer jobs for technicians and factory workers and the middle-class wages that come with them.