Firms seek to minimize fixed labor costs by using contractors, “temps” and part-timers. Obamacare intensifies the pressures, because the incentives against hiring full-time workers are so obvious. A survey by the New York Federal Reserve of manufacturers in the state found that 6.5 percent had already refrained from hiring or had fired workers to stay below the 50-worker threshold; 5.4 percent said they had substituted some part-time for full-time workers. (These firms apparently represented a large share of the companies subject to the threshold, because most firms had more than 50 workers. The average firm employed 218.) A survey by the Philadelphia Federal Reserve produced a similar response.
Up to a point, part-time jobs reflect the flexibility of the U.S. economy — but we are well beyond that point. They increasingly signify weakness.