America created 10 million new jobs in the last decade. Almost all of them are temporary or contract gigs.

Despite low unemployment rates, the job market may still be unstable.

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Ninety-four percent of the 10 million net new jobs created between 2005 and 2015 were either temporary or contract-based, not conventional 9-to-5 positions, according to a study by Princeton and Harvard economists. In that time period, the proportion of American workers engaged in some type of alternative employment jumped from 10.7 percent to 15.8 percent, Quartz reports.

Women in particular saw increased participation in the gig economy, particularly because the largest sectors making the transition away from the typical full-time job — like education and medicine — are already female-heavy.