Here is a brief excerpt from an article written by Richard Dobbs, Anu Madgavkar, James Manyika, Jonathan Woetzel, Jacques Bughin, Eric Labaye, and Pranav Kashyap for the McKinsey Quarterly, published by McKinsey & Company. To read the complete article, check out other resources, learn more about the firm, obtain subscription information, and register to receive email alerts, please click here.

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The real incomes of about two-thirds of households in 25 advanced economies were flat or fell between 2005 and 2014. Without action, this phenomenon could have corrosive economic and social consequences.

Most people growing up in advanced economies since World War II have been able to assume they will be better off than their parents. For much of the time, that assumption has proved correct: except for a brief hiatus in the 1970s, buoyant global economic and employment growth over the past 70 years saw all households experience rising incomes, both before and after taxes and transfers. As recently as between 1993 and 2005, all but 2 percent of households in 25 advanced economies saw real incomes rise.

Yet this overwhelmingly positive income trend has ended. A new McKinsey Global Institute report, Poorer than their parents? Flat or falling incomes in advanced economies, finds that between 2005 and 2014, real incomes in those same advanced economies were flat or fell for 65 to 70 percent of households, or more than 540 million people (exhibit). And while government transfers and lower tax rates mitigated some of the impact, up to a quarter of all households still saw disposable income stall or fall in that decade.

These findings provide a new perspective on the growing debate in advanced economies about income inequality, which until now has largely focused on income and wealth gains going disproportionately to top earners. Our analysis details the sharp increase in the proportion of households in income groups that are simply not advancing—a phenomenon affecting people across the income distribution. And the hardest hit are young, less-educated workers, raising the spectre of a generation growing up poorer than their parents.

While the recession and slow recovery after the 2008 global financial crisis were a significant contributor to this lack of income advancement, other long-run factors played a role—and will continue to do so. They include demographic trends of aging and shrinking household sizes as well as labor-market shifts such as the falling wage share of GDP.

The economic and social impact is potentially corrosive. A survey we conducted as part of our research found that a significant number of those whose incomes have not been advancing are losing faith in aspects of the global economic system. Nearly one-third of those who are not advancing said they think their children will also advance more slowly in the future, and they expressed negative opinions about free trade and immigration.

If the low economic growth of the past decade continues, the proportion of households in income segments with flat or falling incomes could rise as high as 70 to 80 percent over the next decade. Even if economic growth accelerates, the issue will not go away: the proportion of households affected would decrease, to between about 10 and 20 percent—but that share could double if the growth is accompanied by a rapid uptake of workplace automation.

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Richard Dobbs is a senior partner of the McKinsey Global Institute, where Anu Madgavkar is a partner and James Manyika, Jonathan Woetzel, and Jacques Bughin are directors; Eric Labaye is a senior partner in McKinsey’s Paris office; and Pranav Kashyap is a consultant in the Silicon Valley office.