There has been a shift away from steady employment to “gig” jobs, like Uber, where on-demand drivers summoned by an app set their own hours and are paid by the ride instead of an hourly wage, reports Anna Louise Sussman and Josh Zumbrun for The Wall Street Journal.

But Uber isn’t the only gig company to shake things up. These days, more people are pursing alternative work arrangement jobs. The rise has happened even across industries including health care and education, manufacturing and public administration, with professions that have traditionally offered stable employment.

Since 2005, the number of workers in alternative arrangements has climbed by more than half, rising to nearly 16% of the workforce from 10% a decade ago, according to forthcoming research by Alan Krueger of Princeton University and Lawrence Katz of Harvard University. Meanwhile, the on-demand workforce or gig economy employs only about 600,000 people, or less than 0.5% of the workforce, the research finds.

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