Like a bad summer-pop earworm, some economic ideas get stuck in our heads for no good reason and refuse to go away.
Take, for example, the remarkably durable myth that Obama has presided over a "part-time economy," where full-time work has been devastated by his relentlessly anti-capitalist policies. The Atlantic has done our best to bust this myth, but there's no killing some summer earworms, and so, like a particularly terrible Top 40 DJ, here comes Mort Zuckerman, spinning the old track on the Wall Street Journal op-ed page.
It's impossible to briefly sum up Zuckerman's argument—"The Full-Time Scandal of Part-Time America"—which is a collage of bad stats and randomly drawn lines of causality. The gist is that the U.S. economy only makes part-time jobs now, and Obamacare is hastening the demise of full-time work.
The easiest way to fact-check the claim that part-time work is rising is to measure Americans working part-time who want to work full time—i.e. "for economic reasons." It turns out that the entire increase in part-time employment happened before Obamacare became a law in 2010. [Y-axis in 1,000s]
This Is 'Part-Time America': I
As for the claim that involuntary part-time work is replacing full-time work? I think these two lines tell you all you need to know [Y-axis in 1,000s, again]: