These were jobs where people with limited education used to be able to raise a family with a middle class standard of living. However computers, robots and other technological innovations are rapidly reducing the need for such work. As a result, the remaining jobs in these sectors are likely to pay less and many people who would have otherwise worked at middle wage jobs must instead crowd into the lower paying sectors of the labor market.
This story is comforting to elites, because it means that inequality is something that happened, not something they did. They won out because they had the skills and intelligence to succeed in a dynamic economy, whereas the huge mass of workers that are falling behind did not. In this story, the best we can do for those left behind is empathy and education. We can increase opportunities to upgrade their skills in the hope that more of them may be able to join the winners.
That's a nice story, but the evidence doesn't support it. My colleagues Larry Mishel, John Schmitt, and Heidi Sheirholz, just published a paper showing that the pattern of job growth in the data doesn't fit this picture at all. This paper touches on a wide variety of issues related to technology and wage inequality, but first and foremost, it shows that the story of the hollowing out of the middle does not fit the data for the 2000s at all.
Since 2000, the increase in employment has occurred almost entirely in low-wage occupations. There has been a decline in relative employment for both workers in middle wage and high wage occupations. If this "occupational shift story" explained trends in wages we should expect to see sharply rising wages for retail clerks, custodians and other workers employed in low-paying occupations.
Of course, we see the opposite. Workers in these occupations continued to lose ground in the 2000s as they did in the prior two decades. Their wages barely kept pace with inflation over the last three decades.
The paper makes an impressive case that technology is not the main explanation for the rise in inequality that we have been seeing. In fact, even MIT economics professor David Autor, the leading proponent of the occupational shift story concedes this point. He was quoted in a New York Times column saying of the view that technology explains inequality:
It can suck all the air out of the conversation ... All economists should be pushing back against this simplistic view.
Given the evidence compiled by Mishel et al, it would be difficult to maintain that technology has been the main culprit in the upward redistribution of income that we have seen.
It is not difficult to identify other potential culprits - trade would certainly rank high on the list. A trade policy that quite deliberately puts factory workers in direct competition with low-paid workers in the developing world, while protecting doctors and other highly paid professionals, would be expected to redistribute income from the former to the latter.
The weakening of unions is likely also an important factor. The private sector unionization rate in the United States has shrunk from over 20% in the 1970s to less than 7% at present. In the same vein, the deregulation of major industries like airlines, telecommunications, and trucking has been another factor putting downward pressure on wages. The higher unemployment rates we have seen, not just in the last five years but in the last 35 years, compared with the early post-war decades, has also weakened the bargaining power of workers at the middle and bottom of the pay ladder.
We have also seen big changes that contributed to growth of income at the top. The highlights in this category would be deregulation in the financial sector and the changes in corporate governance that pretty much allow top management to write their own pay checks.
The big difference between the items listed above and the occupational shift story is that this is a list of items that involve policy changes. If this list (which could be extended) explains the growth in inequality over the last three decades then, it means that inequality was a result of policy. It was not something that just happened; it was something that we did or was done to us.
That presents a very different policy agenda for addressing inequality. No one would quarrel with the idea that our children should get a better education, but if a lack of skills was not the cause of inequality, more skills will not be the solution. Rather, we might look at an agenda that would rein in finance and CEO pay, restore the strength of labor unions, and include a more balanced trade policy.
This agenda wouldn't just mean empathy from those on top, but also lead to them losing some of their gains from the last three decades. Therefore we are likely to keep hearing stories about technology destroying middle wage jobs for some time, even if the evidence doesn't back up the stories.