Here’s a fact that should give economists—and maybe President Obama’s political team—heartburn: Two years after the Great Recession officially ended, job prospects for young Americans remain historically grim. More than 17 percent of 16-to-24-year-olds who are looking for work can’t find a job, a rate that is close to a 30-year high. The employment-to-population ratio for that demographic—the percentage of young people who are working—has plunged to 45 percent. That’s the lowest level since the Labor Department began tracking the data in 1948. Taken together, the numbers suggest that the U.S. job market is struggling mightily to bring its next generation of workers into the fold.

This is a dangerous proposition, economically (for the United States as a whole) and politically (for the president).