Wage stagnation in the US: more than meets the eye

If you can, always look below the surface of data.

Via the Economist journalist Daniel Knowles comes a good example of why its important to look below the surface of statistics. American economist Steve Landsburg addresses a commonly heard refrain – that the wage of the median worker has barely risen in the past thirty years – and shows that all is not as it seems.

Landsburg cites a book by economist Edward Conard (first chapter, containing what we're talking about, here), which itself cites the Census Bureau. I confess that, without a more specific citation, I can't find the exact data Conard uses, but have found similar enough data (pdf, table A-5) to confirm the overall thrust of the argument.

Conard shows that from 1980 to 2005, median income in the US rose just 3 per cent once inflation is taken into account, from $25,000 to $25,700. 2005 is pre-crash, as well, so this isn't a tale of the recession.

But when you break the data down by race and gender, a very different story appears:

  1980 Median 2005 Median Increase
All Workers 25,000 25,700 3%
White Men 30,700 35,200 15%
Nonwhite Men 19,300 22,300 16%
White Women 11,200 19,600 75%
Nonwhite Women 10,200 16,500 62%

For every single demographic group, there was a much bigger increase in the median wage than we see when the groups are combined. The reason for this is obvious when it's pointed out: demographic change in the US means that there are far more (low-salaried) women and people of colour working now than there were in 2005, which pushes the overall average down.

Landsburg illustrates it with a farmyard analogy:

Imagine a farmer with a few 100-pound goats and a bunch of 1000-pound cows. His median animal weighs 1000 pounds. A few years later, he’s acquired a whole lot more goats, all of which have grown to 200 pounds, while his cows have all grown to 2000. Now his median animal weighs 200 pounds.

A very silly person could point out to this farmer that his median animal seems to be a lot scrawnier these days. The farmer might well reply that both his goats and his cows seem to be doing just fine, at least relative to where they were.

This is almost an example of Simpson's Paradox, a well-known (to stats nerds) effect where the direction of a correlation disappears when that correlation is disaggregated. I was taught it with an example involving racial discrepancies in application of the death penalty:

Sixty per cent of white murderers are executed for their crimes, and fifty per cent of black murderers. Are black people discriminated against in the application of the death penalty?

Now suppose that we break down the murder victims by race as well. We find the common pattern that people tend to attack victims of their own race:

Number of murders where death penalty is applied

White Murderer Black Murderer
White Victim 50/70=71% 25/30=83%
Black Victim 10/30=33% 25/70=36%

What about now? Does it begin to look like black people are discriminated against? In this example, black people are more likely to be executed for the murder of black or white victims; but because the murder of black victims isn't taken as seriously by the courts, the fact that murderers predominantly attack people of their race makes it look like black people are less likely to be executed than white people.

The median income example isn't quite a case of Simpson's Paradox, because there is still a positive increase in wage whether or not the statistics are disaggregated. But it's still an example of a time when it is best to dig beneath the surface.

But there is more to be said on the story of wage stagnation. Because a second claim normally accompanies the belief that US wages have stagnated, and that is that there has been a "decoupling" of wages. Due to rising inequality, the median household wage hasn't risen as fast as the mean wage:

If we've seen that the median wage grows faster when disaggregated, then the solid red line is likely to take a steeper ascent. But what happens to the dashed red line when disaggregated?

Sadly, I cannot find the data required to answer the question. If anyone knows where to look, tell me, and maybe we can put the issue to rest.

An immigrant worker protests in Orlando, Florida. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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The polls are bad, but Jeremy Corbyn’s office has a secret weapon

How a shake-up of the leadership team has steadied nerves at the top of Labour. 

If polling had existed back in 1906, Jeremy Corbyn quipped at one recent strategy meeting, the Labour Party would never have got started.

As far as Labour’s direction is concerned, it is that meeting at four o’clock every Monday afternoon that matters. The people who attend it regularly are the Labour leader, his aides, the shadow home secretary, Diane Abbott, and the shadow chancellor, John McDonnell, as well as the party’s election co-ordinator, and their respective aides.

In recent weeks, the meetings have been stormy affairs, and not only because the numbers from the party’s own pollsters, BMG Research, mirror the uniformly bleak picture from the public polls. There is also concern over Karie Murphy, Corbyn’s office manager. Murphy is highly rated by Corbyn for having brought increased intensity and efficiency to the leader’s office. Corbyn often struggles to deliver bad news in person and appreciates that Murphy will intervene on his behalf.

Her intensity is not uniformly welcomed. “She could start a fight with her own reflection,” in the wry words of one friend. An argument with Jon Trickett – the Hemsworth MP whose unusual career trajectory took him from being a parliamentary aide to Peter Mandelson to the inner sanctum of Ed Miliband’s leadership and finally to the role of election co-ordinator for Corbyn – led to Trickett going on a two-week strike, recusing himself from vital meetings and avoiding any contact with Murphy.

That row eventually led to Trickett being stripped of his role and banished from the Monday meeting. Murphy had a similar turf war with the campaigns director, Simon Fletcher, which culminated in Fletcher resigning on 17 February. In a letter to staffers, he called on the party to “keep the promise” of Corbyn’s first leadership bid, a period when Fletcher was central and Murphy had yet to start working for the Labour leader.

All of which, in better political weather, would simply be part of the back-and-forth of office politics. However, set against the backdrop of unease about by-elections in Stoke-on-Trent Central and Copeland, and a series of unhelpful leaks, it adds to a sense of vulnerability around the leadership. One loyalist shadow cabinet minister calls it “the most dangerous time” for Corbyn since he was first elected leader.

Why the danger? Contrary to popular myth, the backbone of Jeremy Corbyn’s successive landslide victories was not a hard-pressed twentysomething, struggling to find a fixed job or to get a foot on the housing ladder. The shock troops of Corbynism, at least as far as the internal battle in the Labour Party went, were baby boomers. Many of them were either working in, or on early retirement from, a charity or the public sector, deeply concerned about the rightward drift of British politics and worried about the next generation.

Corbyn’s decision to whip Labour MPs in support of triggering Article 50 – the process whereby Britain will begin its exit from the European Union – was, in their eyes, a double heresy. The vote signalled acceptance that the forces of the Eurosceptic right had won on 23 June, and it conceded that visa-free travel, membership of the single market and freedom of movement are over.

None of this is automatically great news for Corbyn’s internal critics – not least because the vote on Article 50 is rare in being an issue that unites Corbyn with most Labour MPs. Yet it adds to the sense that his leadership has passed its best-before date.

Adding to the general malaise is a series of unhelpful leaks. There was a story in the Sunday Times on 12 February claiming that the leadership was road-testing possible replacements for Corbyn, and on 20 February the Mirror claimed that the Labour leadership had commissioned a poll to find out whether or not the leader should quit his post. These stories are hotly denied by the leader’s office. Some in Corbyn’s inner circle believe they are the work of Trickett, embittered at his demotion.

It is true that Corbyn is not enjoying the job as much as he once did. However, if the conversation shifts from the minutiae of Brexit to his natural terrain of the NHS and the continuing consequences of government cuts on education and the prisons service, he could quickly find himself relishing the role once more.

Corbyn retains two powerful cards. His newly energised office, under Karie Murphy, is one. Although her brisk approach has generated some public rows, the feeling in the leader’s office is that a chief of staff was needed, and Murphy has assumed that role. The media team has also grown sharper with the addition of David Prescott (son of John), Matt Zarb-Cousin and the former Momentum spokesman James Schneider.

Corbyn’s second asset is more unexpected. His rivals inside the party now fear rather than relish an immediate end to his leadership. A former shadow cabinet member splits his supporters into two groups: “idealists and ideologues – the first we can inspire and win over, the second have to be got rid of”. In their view, the idealists have not yet moved away from Corbyn enough to guarantee victory; the ideologues, for their part, will slink off as Corbyn puts the demands of his office above their interests, as he did over Article 50.

Although self-defeating panic has never been a rare commodity in the Labour Party, the settled view of Labour MPs is that their leader must be given time and space rather than hustled out of the door. There is an awareness, too, that MPs who are united in opposition to Corbyn are divided over many other issues.

So, while the inner circle’s Monday meetings might be fraught, and Labour’s current polling would have given Keir Hardie pause, Jeremy Corbyn is safe. 

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.

This article first appeared in the 24 February 2017 issue of the New Statesman, The world after Brexit