By Lawrence Summers
The opinions expressed are his own.

The principal problem facing the United States and Europe for the next few years is an output shortfall caused by lack of demand. Nothing would do more to increase the incomes of all citizens—poor, middle class and rich—than an increase in demand, which would bring with it increases in incomes, living standards, and confidence. A more rapid recovery than now appears likely would reverse, at least partially, a growing disillusionment with almost all institutions and doubts about the future.

It would be, however, a serious mistake to suppose that our only problems are cyclical or amenable to macroeconomic solutions. Just as evolution from an agricultural to an industrial economy had far reaching implications for society, so too will the evolution from an industrial to a knowledge economy. Witness structural trends that predate the Great Recession and will be with us long after recovery is achieved: The most important of these is the strong shift in the market reward for a small minority of persons, relative to the rewards available to everyone else. In the United States, according to a recent CBO study, the incomes of the top 1 percent of the population have, after adjusting for inflation, risen by 275 percent from 1979 to 2007. At the same time, incomes for the middle class (in the study, the middle 60 percent of the income scale) grew by only 40 percent. Even this dismal figure overstates the fortunes of typical Americans; the number unable to find work or who have abandoned the job search has risen. In 1965, only 1 in 20 men between ages 25 and 54 was not working. By the end of this decade it will likely be 1 in 6—even if a full cyclical recovery is achieved.

To highlight the disturbing trends in a different way, one calculation suggests that if income distribution had remained constant in the U.S. over the 1979-2007 period, incomes of the top 1 percent would be 59 percent or $780,000 lower and the incomes of the average member of the bottom 80 percent of the population would be 21 percent or over $10,000 dollars higher.

Those looking to remain serene in the face of these trends, or who favor policies that would disproportionately cut taxes at the high end and so exacerbate inequality, assert, for example, that what could be called “snapshot inequality” is not a problem, as long as there is mobility within people’s lifetimes and across generations. The reality is that there is too little of both. Inequality in lifetime incomes is already only marginally smaller than inequality in a single year. And tragically, according to the best available information, intergenerational mobility in the United States is now poor by international standards, and, probably for the first time in U.S. history, is no longer improving. To take just one statistic, the share of students in college coming from families in the lowest quarter of the income distribution has fallen over the last generation, while the share from the richest has actually increased. Given the pressures associated with recession, it appears that more elite American colleges and universities have dropped need-blind admissions than have adopted it in recent years.

Why has the top 1 percent of the population done so well relative to the rest of the population? Probably the answer lies substantially in changes in technology and in globalization. When George Eastman revolutionized photography he did very well, and because he needed a large number of Americans to carry out his vision, the city of Rochester had a thriving middle class for two generations. When Steve Jobs revolutionized personal computing, he and the shareholders in Apple (who are spread all over the world) did very well, but a much smaller benefit flowed to middle class American workers, both because production was outsourced and because the production of computers and software was not terribly labor intensive. In the same way, the moves from small independent bookstores to megastores like Barnes and Noble, and now to Amazon and e-books, have meant that more books at less cost are available to consumers, but also mean fewer jobs for middle class workers in retail, publishing and distribution, and greater rewards for superstar authors and entrepreneurs who are transforming the way content is delivered. One other manifestation of progress is that increasingly sophisticated financial markets have provided ever-greater opportunities for those like Warren Buffett, with the ability to detect errors in prevailing valuations, to profit handsomely.