During the past three decades the relation between unemployment and employment has been almost perfectly inverse. (See the nearby chart.) When the employment-to-population ratio rises, the unemployment rate falls. When the unemployment rate rises, the employment-to-population ratio falls. Even the turning points are aligned. Consequently, the unemployment rate has been a very good proxy for the employment rate. But that relationship has completely broken down during the most recent recession.

While the unemployment rate has fallen over the past 3½ years, the employment-to-population ratio has stayed almost constant at about 58.5%, well below the prerecession peak. Jobs are always being created and destroyed, and the net number of jobs over the last 3½ years has increased. But so too has the size of the working-age population. Job growth has been just slightly better than what it takes to keep the employed proportion of the working-age population constant. That’s why jobs still seem so scarce.

The U.S. is not getting back many of the jobs that were lost during the recession. At the present slow pace of job growth, it will require more than a decade to get back to full employment defined by prerecession standards…

Why have so many workers dropped out of the labor force and stopped actively seeking work? Partly this is due to sluggish economic growth. But research by the University of Chicago’s Casey Mulligan has suggested that because government benefits are lost when income rises, some people forgo poor jobs in lieu of government benefits—unemployment insurance, food stamps and disability benefits among the most obvious. The disability rolls have grown by 13% and the number receiving food stamps by 39% since 2009.