The U.S. job market is slowly improving, and most economists expect that gradual recovery to continue this year. Yet one of the most disturbing trends of the Great Recession is still very far from being reversed. America’s middle-class jobs have been decimated since 2007, replaced largely by low-wage jobs.

A recent presentation from the Federal Reserve Bank of San Francisco lays out the situation clearly, citing data from the National Employment Law Project: The vast majority of job losses during the recession — about 60 percent — were in middle-income occupations paying between $13.83 and $21.13 per hour. But those mid-wage jobs have made up just 27 percent of the jobs gained during the recovery.

By contrast, low-wage occupations paying less than $13.83 per hour have utterly dominated the recovery, with 58 percent of the job gains since 2010.

That has put downward pressure on wages. “[M]any middle-class workers have lost their jobs and, if they have been able to secure new employment at all, find themselves earning far lower wages post-recession,” the San Francisco Fed notes. “[O]n average over the next 25 years, these workers will earn 11% less than similar workers who retained their jobs through the recession.”

So what types of low-wage jobs are we talking about? Nearly 40 percent of the jobs gained since the recovery began — about 1.7 million — have come from three low-wage sectors: food services, retail and “employment services” (a sweeping category encompassing such jobs as office clerks and sales representatives).

As the San Francisco Fed presentation notes, just four low-wage sectors made up nearly 12 percent of the workforce in 2011: retail sales, cashiers, office clerks and food preparation and service workers. “[T]hese occupations are crucial to the support and growth of major industries across the country, but many of these workers do not earn enough to adequately support their families, even at a subsistence level.”

By contrast, many mid-wage industries, such as construction, manufacturing, insurance, real estate and IT, have either stagnated or grown too slowly to make up for their prerecession losses.

What’s more, the NELP report notes, budget cuts to state and local governments have taken away a major source of mid- and higher-wage jobs. And a separate chunk of middle-wage jobs — including carpenters, painters and electricians — are still waiting for the housing market to recover.

This isn’t a new phenomenon: In the past decade, high-wage and low-wage jobs have been growing at a decent clip. But that middle rung continues to get hollowed out. Mid-wage jobs endured a major drop after the 2001 recession, largely stagnated during the 2000s and have now declined even further in the most recent downturn.

Economists have been debating the underlying causes of this growing divergence for years now. Some, such as Harvard’s Lawrence Katz and Claudia Goldin, argue that new technologies and machines are now displacing mid-wage jobs at the assembly line and elsewhere. Others, such as Larry Mishel of the Economic Policy Institute, point to explicitly political factors, from the decline of labor unions to the falling minimum wage.

Yet whatever the cause, the hollowing out of mid-wage jobs has been accelerating sharply. And if the trend continues, the NELP report notes, it’s very likely to exacerbate income inequality in the United States.

The San Francisco Fed presentation, for its part, spends some time discussing how to lift people out of that lower-middle-income rung — although it sidesteps drastic ideas such as raising the minimum wage or bolstering labor unions. Instead, there’s a lot of focus on vocational training, which has had only mixed success of late:

It goes on to suggest a few other small-bore remedies, from affordable-housing programs to making job-training programs cheaper and easier. But there’s a larger trend taking place in the U.S. — in which low-wage jobs are displacing middle-wage jobs — that’s becoming increasingly difficult to fight against with small policy tweaks.

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