Belief in “the green light, the orgiastic future that year by year recedes before us,” as F. Scott Fitzgerald wrote in The Great Gatsby, is a characteristic American trait. But hope in a better future is not uniquely American, even if it has long been a more potent secular faith in the United States than elsewhere. The belief has older roots. It was the product of a shift in the temporal location of the golden age from a long-lost past to an ever-brighter future.

That shift was conceived and realized with the Enlightenment and then the Industrial Revolution. As human beings gained ever-greater control of the forces of nature and their economies became ever more productive, they started to hope for lives more like those of the gods their ancestors had imagined.

People might never be immortal, but their lives would be healthy and long. People might never move instantaneously, but they could transport themselves and their possessions swiftly and cheaply across great distances. People might never live on Mount Olympus, but they could enjoy a temperate climate, 24-hour lighting, and abundant food. People might never speak mind to mind, but they could communicate with as many others as they desired, anywhere on the planet. People might never enjoy infinite wisdom, but they could gain immediate access to the knowledge accumulated over millennia.

All of this has already happened in the world’s richest countries. It is what the people of the rest of the world hope still to enjoy.

Is a yet more orgiastic future beckoning? Today’s Gatsbys have no doubt that the answer is yes: humanity stands on the verge of breakthroughs in information technology, robotics, and artificial intelligence that will dwarf what has been achieved in the past two centuries. Human beings will be able to live still more like gods because they are about to create machines like gods: not just strong and swift but also supremely intelligent and even self-creating.

Yet this is the optimistic version. Since Mary Shelley created the cautionary tale of Frankenstein, the idea of intelligent machines has also frightened us. Many duly point to great dangers, including those of soaring unemployment and inequality.

But are we likely to experience such profound changes over the next decade or two? The answer is no.

SMALL CHANGE

In reality, the pace of economic and social transformation has slowed in recent decades, not accelerated. This is most clearly shown in the rate of growth of output per worker. The economist Robert Gordon, doyen of the skeptics, has noted that the average growth of U.S. output per worker was 2.3 percent a year between 1891 and 1972. Thereafter, it only matched that rate briefly, between 1996 and 2004. It was just 1.4 percent a year between 1972 and 1996 and 1.3 percent between 2004 and 2012.

On the basis of these data, the age of rapid productivity growth in the world’s frontier economy is firmly in the past, with only a brief upward blip when the Internet, e-mail, and e-commerce made their initial impact.

Those whom Gordon calls “techno-optimists”—Erik Brynjolfsson and Andrew McAfee of the Massachusetts Institute of Technology, for example—respond that the GDP statistics omit the enormous unmeasured value provided by the free entertainment and information available on the Internet. They emphasize the plethora of cheap or free services (Skype, Wikipedia), the scale of do-it-yourself entertainment (Facebook), and the failure to account fully for all the new products and services. Techno-optimists point out that before June 2007, an iPhone was out of reach for even the richest man on earth. Its price was infinite. The fall from an infinite to a definite price is not reflected in the price indexes. Moreover, say the techno-optimists, the “consumer surplus” in digital products and services—the difference between the price and the value to consumers—is huge. Finally, they argue, measures of GDP underestimate investment in intangible assets.

In reality, the pace of economic and social transformation has slowed in recent decades, not accelerated.

These points are correct. But they are nothing new: all of this has repeatedly been true since the nineteenth century. Indeed, past innovations generated vastly greater unmeasured value than the relatively trivial innovations of today. Just consider the shift from a world without telephones to one with them, or from a world of oil lamps to one with electric light. Next to that, who cares about Facebook or the iPad? Indeed, who really cares about the Internet when one considers clean water and flushing toilets?

Over the past two centuries, historic breakthroughs have been responsible for generating huge unmeasured value. The motor vehicle eliminated vast quantities of manure from urban streets. The refrigerator prevented food from becoming contaminated. Clean running water and vaccines delivered drastic declines in child mortality rates. The introduction of running water, gas and electric cookers, vacuums, and washing machines helped liberate women from domestic labor. The telephone removed obstacles to speedy contact with the police, fire brigades, and ambulance services. The discovery of electric light eliminated forced idleness. Central heating and air conditioning ended discomfort. The introduction of the railroad, the steam ship, the motor car, and the airplane annihilated distance.

The radio, the gramophone, and the television alone did far more to revolutionize home entertainment than the technologies of the past two decades have. Yet these were but a tiny fraction of the cornucopia of innovation that owed its origin to the so-called general-purpose technologies—industrialized chemistry, electricity, and the internal combustion engine—introduced by what is considered the Second Industrial Revolution, which occurred between the 1870s and the early twentieth century. The reason we are impressed by the relatively paltry innovations of our own time is that we take for granted the innovations of the past.

Gordon also notes how concentrated the period of great breakthroughs was. As he writes:

Electric light and a workable internal combustion engine were invented in a three-month period in late 1879. The number of municipal waterworks providing fresh running water to urban homes multiplied tenfold between 1870 and 1900. The telephone, phonograph, and motion pictures were all invented in the 1880s.

And the benefits of these mainstays of the Second Industrial Revolution, Gordon points out, “included subsidiary and complementary inventions, from elevators, electric machinery and consumer appliances; to the motorcar, truck, and airplane; to highways, suburbs, and supermarkets; to sewers to carry the wastewater away.”

PAST, NOT PROLOGUE

The technologies introduced in the late nineteenth century did more than cause three generations of relatively high productivity growth. They did more, too, than generate huge unmeasured economic and social value. They also brought with them unparalleled social and economic changes. An ancient Roman would have understood the way of life of the United States of 1840 fairly well. He would have found that of 1940 beyond his imagination.

Among the most important of these broader changes were urbanization and the huge jumps in life expectancy and standards of education. The United States was 75 percent rural in the 1870s. By the mid-twentieth century, it was 64 percent urban. Life expectancy rose twice as fast in the first half of the twentieth century as in the second half. The collapse in child mortality is surely the single most beneficial social change of the past two centuries. It is not only a great good in itself; it also liberated women from the burden, trauma, and danger of frequent pregnancies. The jump in high school graduation rates—from less than ten percent of young people in 1900 to roughly 80 percent by 1970—was a central driver of twentieth-century economic growth.

All these changes were also, by their nature, one-offs. This is also true of the more recent shift of women entering the labor force. It has happened. It cannot be repeated.

The reason we are impressed by the relatively paltry innovations of our own time is that we take for granted the innovations of the past.

Yet there is something else of compelling importance in the contrast between the breakthroughs of the nineteenth and early twentieth centuries and those of the second half of the twentieth and the early twenty-first century. The former were vastly broader, affecting energy; transportation; sanitation; food production, distribution, and processing; entertainment; and, not least, entire patterns of habitation. Yes, computers, mobile telecommunications, and the Internet are of great significance. Yet it is also essential to remember what has not changed to any fundamental degree. Transportation technologies and speeds are essentially the same as they were half a century ago. The dominant source of commercial energy remains the burning of fossil fuels—introduced with coal and steam in the First Industrial Revolution, of the late eighteenth and early nineteenth centuries—and even nuclear power is now an elderly technology. Although fracking is noteworthy, it does not compare with the opening of the petroleum age in the late nineteenth century.

Killer app: vacuuming the den, circa 1950. George Marks / Getty Images

The only recent connections between homes and the outside world are satellite dishes and broadband. Neither is close to being as important as clean water, sewerage, gas, electricity, and the telephone. The great breakthroughs in health—clean water, sewerage, refrigeration, packaging, vaccinations, and antibiotics—are also all long established.

THE FUTURE'S NOT WHAT IT USED TO BE

The so-called Third Industrial Revolution—of the computer, the Internet, and e-commerce—is also itself quite old. It has already produced many changes. The armies of clerks who used to record all transactions have long since disappeared, replaced by computers; more recently, so have secretaries. E-mail has long since replaced letters. Even the Internet and the technologies that allow it to be searched with ease are now 15 years old, or even older, as is the e-commerce they enabled.

Yet the impact of all of this on measured productivity has been modest. The economic historian Paul David famously argued in 1989 that one should remember how long it took for industrial processes to adapt to electricity. But the computer itself is more than half a century old, and it is now a quarter of a century since David made that point. Yet except for the upward blip between 1996 and 2004, we are still—to adapt the Nobel laureate Robert Solow’s celebrated words of 1987—seeing the information technology age “everywhere but in the productivity statistics.”

Meanwhile, other, more recent general-purpose technologies—biotechnology and nanotechnology, most notably—have so far made little impact, either economically or more widely.

The disappointing nature of recent growth is also the theme of an influential little book, The Great Stagnation, by the economist Tyler Cowen, which is subtitled How America Ate All the Low-Hanging Fruit of Modern History, Got Sick, and Will (Eventually) Feel Better. As Cowen writes:

The American economy has enjoyed . . . low-hanging fruit since at least the seventeenth century, whether it be free land, . . . immigrant labor, or powerful new technologies. Yet during the last 40 years, that low-hanging fruit started disappearing, and we started pretending it was still there. We have failed to recognise that we are at a technological plateau and the trees are more bare than we would like to think. That’s it. That is what has gone wrong.

In considering the disappointing impact of recent innovations, it is important to note that the world’s economies are vastly bigger than they used to be. Achieving a two percent economy-wide annual rise in labor productivity may simply be a much bigger challenge than it was in the past.

More important, the share of total output of the sectors with the fastest growth in productivity tends to decline over time, while the share of the sectors where productivity growth has proved hardest to increase tends to rise. Indeed, it is possible that productivity growth will essentially cease because the economic contribution of the sectors where it is fastest will become vanishingly small. Raising productivity in manufacturing matters far less now that it generates only about an eighth of total U.S. GDP. Raising productivity in caring for the young, the infirm, the helpless, and the elderly is hard, if not impossible.

A radio apparatus similar to the one used to transmit the first wireless signal across the Atlantic Ocean, 1901. Wikimedia Commons

Yet perhaps paradoxically, recent technological progress might still have had some important effects on the economy, and particularly the distribution of income, even if its impact on the size of the economy and overall standards of living has been relatively modest. The information age coincided with—and must, to some extent, have caused—adverse economic trends: the stagnation of median real incomes, rising inequality of labor income and of the distribution of income between labor and capital, and growing long-term unemployment.

Information technology has turbocharged globalization by making it vastly easier to organize global supply chains, run 24-hour global financial markets, and spread technological know-how. This has helped accelerate the catch-up process of emerging-market economies, notably China. It has also allowed India to emerge as a significant exporter of technological services.

Technology has also brought about the rise of winner-take-all markets, as superstars have come to bestride the globe. Substantial evidence exists, too, of “skills-biased” technological change. As the demand for and rewards offered to highly skilled workers (software programmers, for example) rise, the demand for and rewards offered to those with skills in the middle of the distribution (such as clerks) decline. The value of intellectual property has also risen. In brief, a modest impact on aggregate output and productivity should not be confused with a modest impact across the board.

NO CRYSTAL BALL REQUIRED

The future is, at least to some extent, unknowable. Yet as Gordon suggests, it is not all that unknowable. Back in the nineteenth and early twentieth centuries, many had already realized the changes that the recent inventions might bring. The nineteenth-century French novelist Jules Verne is a famous example of such foresight.

The optimistic view is that we are now at an inflection point. In their book The Second Machine Age, Brynjolfsson and McAfee offer as a parallel the story of the inventor of chess, who asked to be rewarded with one grain of rice on the first square of his board, two on the second, four on the third, and so forth. Manageable in size on the first half of the board, the reward reaches mountainous proportions toward the end of the second. Humanity’s reward from Moore’s law—the relentless doubling of the number of transistors on a computer chip every two years or so—will, they argue, grow similarly.

These authors predict that we will experience

two of the most amazing events in history: the creation of true machine intelligence and the connection of all humans via a common digital network, transforming the planet’s economics. Innovators, entrepreneurs, scientists, tinkerers, and many other types of geeks will take advantage of this cornucopia to build technologies that astonish us, delight us, and work for us.

In the near term, however, the widely mentioned possibilities—medicine, even bigger data, robots, 3-D printing, self-driving cars—look quite insignificant.

The impact of the biomedical advances so far has been remarkably small, with pharmaceutical companies finding it increasingly difficult to register significant breakthroughs. So-called big data is clearly helping decision-making. But many of its products—ultra-high-speed trading, for example—are either socially and economically irrelevant or, quite possibly, harmful. Three-D printing is a niche activity—fun, but unlikely to revolutionize manufacturing.

Making robots replicate all the complex abilities of human beings has proved extremely difficult. Yes, robots can do well-defined human jobs in well-defined environments. Indeed, it is quite possible that standard factory work will be entirely automated. But the automation of such work is already very far advanced. It is not a revolution in the making. Yes, it is possible to imagine driverless cars. But this would be a far smaller advance than were cars themselves.

Inevitably, uncertainty is pervasive. Many believe that the impact of what is still to come could be huge. The economist Carl Benedikt Frey and the machine-learning expert Michael Osborne, both of Oxford University, have concluded that 47 percent of U.S. jobs are at high risk from automation. In the nineteenth century, they argue, machines replaced artisans and benefited unskilled labor. In the twentieth century, computers replaced middle-income jobs, creating a polarized labor market.

Over the next decades, they write, “most workers in transportation and logistics occupations, together with the bulk of office and administrative support workers, and labour in production occu­pations, are likely to be substituted by computer capital.” Moreover, they add, “computerisation will mainly substitute for low-skill and low-wage jobs in the near future. By contrast, high-skill and high-wage occupations are the least susceptible to computer capital.” That would exacerbate already existing trends toward greater inequality. But remember that previous advances also destroyed millions of jobs. The most striking example is, of course, in agriculture, which was the dominant employer of humanity between the dawn of the agricultural revolution and the nineteenth century.

The economists Jeffrey Sachs and Laurence Kotlikoff even argue that the rise in productivity generated by the coming revolution could make future generations worse off in the aggregate. The replacement of workers by robots could shift income from the former to the robots’ owners, most of whom will be retired, and the retired are assumed to save less than the young. This would lower investment in human capital because the young could no longer afford to pay for it, and it would lower investment in machines because savings in this economy would fall.

Beyond this, people imagine something far more profound than robots able to do gardening and the like: the “technological singularity,” when intelligent machines take off in a rapid cycle of self-improvement, leaving mere human beings behind. In this view, we will someday create machines with the abilities once ascribed to gods. Is that imminent? I have no idea.

BEEN THERE, DONE THAT

So how might we respond now to these imagined futures?

First, new technologies bring good and bad. We must believe we can shape the good and manage the bad.

Would a surpassed humanity live happily ever after, tended, like children, by solicitous machines?

Second, we must understand that education is not a magic wand. One reason is that we do not know what skills will be demanded three decades hence. Also, if Frey and Osborne are right, so many low- to middle-skilled jobs are at risk that it may already be too late for anybody much over 18 and for many children. Finally, even if the demand for creative, entrepreneurial, and high-level knowledge services were to grow on the required scale, which is highly unlikely, turning us all into the happy few is surely a fantasy.

Third, we will have to reconsider leisure. For a long time, the wealthiest lived a life of leisure at the expense of the toiling masses. The rise of intelligent machines would make it possible for many more people to live such lives without exploiting others. Today’s triumphant puritanism finds such idleness abhorrent. Well then, let people enjoy themselves busily. What else is the true goal of the vast increases in prosperity we have created?

Fourth, we may need to redistribute income and wealth on a large scale. Such redistribution could take the form of a basic income for every adult, together with funding for education and training at any stage in a person’s life. In this way, the potential for a more enjoyable life might become a reality. The revenue could come from taxes on bads (pollution, for example) or on rents (including land and, above all, intellectual property). Property rights are a social creation. The idea that a small minority should overwhelmingly benefit from new technologies should be reconsidered. It would be possible, for example, for the state to obtain an automatic share of the income from the intellectual property it protects.

Fifth, if labor shedding does accelerate, it will be essential to ensure that demand for labor expands in tandem with the rise in potential supply. If we succeed, many of the worries over a lack of jobs will fade away. Given the failure to achieve this in the past seven years, that may well not happen. But we could do better if we wanted to.

The rise of truly intelligent machines, if it comes, would indeed be a big moment in history. It would change many things, including the global economy. Their potential is clear: they would, in principle, make it possible for human beings to live far better lives. Whether they end up doing so depends on how the gains are produced and distributed.

It is also possible that the ultimate result might be a tiny minority of huge winners and a vast number of losers. But such an outcome would be a choice, not a destiny. Techno-feudalism is unnecessary. Above all, technology itself does not dictate the outcomes. Economic and political institutions do. If the ones we have do not give the results we want, we will need to change them.

As for the singularity, it is hard to conceive of such a state of the world. Would a surpassed humanity live happily ever after, tended, like children, by solicitous machines? Would people find meaning in a world in which their intellectual progeny were so vastly superior to themselves?

What we know for the moment is that there is nothing extraordinary in the changes we are now experiencing. We have been here before and on a much larger scale. But the current and prospective rounds of changes still create problems—above all, the combination of weak growth and significant increases in inequality. The challenge, as always, is to manage such changes. The only good reason to be pessimistic is that we are doing such a poor job of this.

The future does not have to be a disappointment. But as Gatsby learned, it can all too easily be just that.