Although the U.S. is on a record streak for job-creation, many Americans still feel like they can't get ahead — it's not their imagination. The last three decades have seen the economy churn out more and more jobs that offer inadequate pay, a group of researchers found. "The history of private-sector employment in the U.S. over the past three decades is one of overall degradation in the ability of many American jobs to support households — even those with multiple jobholders," they wrote. The group wants to popularize a new economic metric, called the Job Quality Index, that goes beyond...