Michael Sandel is a political philosopher and professor at Harvard University. This abridged version appeared in the April 2012 issue ofThe Atlantic magazine. I, like others, have often referred to current efforts to improve U.S. schools, as “market-driven school reform.” Sandel places that phrase in a the larger context of American society over the past quarter-century.

There are some things money can’t buy—but these days, not many. Almost everything is up for sale. For example:

• A prison-cell upgrade: $90 a night. In Santa Ana, California, and some other cities, nonviolent offenders can pay for a clean, quiet jail cell, without any non-paying prisoners to disturb them.

• Access to the carpool lane while driving solo: $8. Minneapolis, San Diego, Houston, Seattle, and other cities have sought to ease traffic congestion by letting solo drivers pay to drive in carpool lanes, at rates that vary according to traffic….

• Your doctor’s cellphone number: $1,500 and up per year. A growing number of “concierge” doctors offer cellphone access and same-day appointments for patients willing to pay annual fees ranging from $1,500 to $25,000….

• The right to immigrate to the United States: $500,000. Foreigners who invest $500,000 and create at least 10 full-time jobs in an area of high unemployment are eligible for a green card that entitles them to permanent residency.

Not everyone can afford to buy these things. But today there are lots of new ways to make money. If you need to earn some extra cash, here are some novel possibilities:

• Sell space on your forehead to display commercial advertising: $10,000. A single mother in Utah who needed money for her son’s education was paid $10,000 by an online casino to install a permanent tattoo of the casino’s Web address on her forehead. Temporary tattoo ads earn less.

• Serve as a human guinea pig in a drug-safety trial for a pharmaceutical company: $7,500. The pay can be higher or lower, depending on the invasiveness of the procedure used to test the drug’s effect and the discomfort involved….

• If you are a second-grader in an underachieving Dallas school, read a book: $2. To encourage reading, schools pay kids for each book they read.

We live in a time when almost everything can be bought and sold. Over the past three decades, markets—and market values—have come to govern our lives as never before. We did not arrive at this condition through any deliberate choice. It is almost as if it came upon us.

As the Cold War ended, markets and market thinking enjoyed unrivaled prestige, and understandably so. No other mechanism for organizing the production and distribution of goods had proved as successful at generating affluence and prosperity. And yet even as growing numbers of countries around the world embraced market mechanisms in the operation of their economies, something else was happening. Market values were coming to play a greater and greater role in social life. Economics was becoming an imperial domain. Today, the logic of buying and selling no longer applies to material goods alone. It increasingly governs the whole of life.

The years leading up to the financial crisis of 2008 were a heady time of market faith and deregulation—an era of market triumphalism. The era began in the early 1980s, when Ronald Reagan and Margaret Thatcher proclaimed their conviction that markets, not government, held the key to prosperity and freedom. And it continued into the 1990s with the market-friendly liberalism of Bill Clinton and Tony Blair, who moderated but consolidated the faith that markets are the primary means for achieving the public good.

Today, that faith is in question. The financial crisis did more than cast doubt on the ability of markets to allocate risk efficiently. It also prompted a widespread sense that markets have become detached from morals, and that we need to somehow reconnect the two. But it’s not obvious what this would mean, or how we should go about it.

Some say the moral failing at the heart of market triumphalism was greed, which led to irresponsible risk-taking. The solution, according to this view, is to rein in greed, insist on greater integrity and responsibility among bankers and Wall Street executives, and enact sensible regulations to prevent a similar crisis from happening again.

This is, at best, a partial diagnosis. While it is certainly true that greed played a role in the financial crisis, something bigger was and is at stake. The most fateful change that unfolded during the past three decades was not an increase in greed. It was the reach of markets, and of market values, into spheres of life traditionally governed by nonmarket norms. To contend with this condition, we need to do more than inveigh against greed; we need to have a public debate about where markets belong—and where they don’t.

Consider, for example, the proliferation of for-profit schools, hospitals, and prisons, and the outsourcing of war to private military contractors. (In Iraq and Afghanistan, private contractors have actually outnumbered U.S. military troops.) Consider the eclipse of public police forces by private security firms—especially in the U.S. and the U.K., where the number of private guards is almost twice the number of public police officers….

Consider too the reach of commercial advertising into public schools, from buses to corridors to cafeterias; the sale of “naming rights” to parks and civic spaces; the blurred boundaries, within journalism, between news and advertising, likely to blur further as newspapers and magazines struggle to survive; the marketing of “designer” eggs and sperm for assisted reproduction; the buying and selling, by companies and countries, of the right to pollute; a system of campaign finance in the U.S. that comes close to permitting the buying and selling of elections.

These uses of markets to allocate health, education, public safety, national security, criminal justice, environmental protection, recreation, procreation, and other social goods were for the most part unheard-of 30 years ago. Today, we take them largely for granted.

Why worry that we are moving toward a society in which everything is up for sale?

For two reasons. One is about inequality, the other about corruption. First, consider inequality. In a society where everything is for sale, life is harder for those of modest means. The more money can buy, the more affluence—or the lack of it—matters. If the only advantage of affluence were the ability to afford yachts, sports cars, and fancy vacations, inequalities of income and wealth would matter less than they do today. But as money comes to buy more and more, the distribution of income and wealth looms larger.

The second reason we should hesitate to put everything up for sale is more difficult to describe. It is not about inequality and fairness but about the corrosive tendency of markets. Putting a price on the good things in life can corrupt them. That’s because markets don’t only allocate goods; they express and promote certain attitudes toward the goods being exchanged. Paying kids to read books might get them to read more, but might also teach them to regard reading as a chore rather than a source of intrinsic satisfaction. Hiring foreign mercenaries to fight our wars might spare the lives of our citizens, but might also corrupt the meaning of citizenship.

Economists often assume that markets are inert, that they do not affect the goods being exchanged. But this is untrue. Markets leave their mark. Sometimes, market values crowd out nonmarket values worth caring about.

When we decide that certain goods may be bought and sold, we decide, at least implicitly, that it is appropriate to treat them as commodities, as instruments of profit and use. But not all goods are properly valued in this way. The most obvious example is human beings. Slavery was appalling because it treated human beings as a commodity, to be bought and sold at auction. Such treatment fails to value human beings as persons, worthy of dignity and respect; it sees them as instruments of gain and objects of use.

Something similar can be said of other cherished goods and practices. We don’t allow children to be bought and sold, no matter how difficult the process of adoption can be or how willing impatient prospective parents might be. Even if the prospective buyers would treat the child responsibly, we worry that a market in children would express and promote the wrong way of valuing them. Children are properly regarded not as consumer goods but as beings worthy of love and care. Or consider the rights and obligations of citizenship. If you are called to jury duty, you can’t hire a substitute to take your place. Nor do we allow citizens to sell their votes, even though others might be eager to buy them. Why not? Because we believe that civic duties are not private property but public responsibilities. To outsource them is to demean them, to value them in the wrong way.

These examples illustrate a broader point: some of the good things in life are degraded if turned into commodities. So to decide where the market belongs, and where it should be kept at a distance, we have to decide how to value the goods in question—health, education, family life, nature, art, civic duties, and so on. These are moral and political questions, not merely economic ones. To resolve them, we have to debate, case by case, the moral meaning of these goods, and the proper way of valuing them.

This is a debate we didn’t have during the era of market triumphalism. As a result, without quite realizing

it—without ever deciding to do so—we drifted from having a market economy to being a market society.

The difference is this: A market economy is a tool—a valuable and effective tool—for organizing productive activity. A market society is a way of life in which market values seep into every aspect of human endeavor. It’s a place where social relations are made over in the image of the market.

The great missing debate in contemporary politics is about the role and reach of markets. Do we want a market economy, or a market society? What role should markets play in public life and personal relations? How can we decide which goods should be bought and sold, and which should be governed by nonmarket values? Where should money’s writ not run?

Even if you agree that we need to grapple with big questions about the morality of markets, you might doubt that our public discourse is up to the task. It’s a legitimate worry. At a time when political argument consists mainly of shouting matches on cable television, partisan vitriol on talk radio, and ideological food fights on the floor of Congress, it’s hard to imagine a reasoned public debate about such controversial moral questions as the right way to value procreation, children, education, health, the environment, citizenship, and other goods. I believe such a debate is possible, but only if we are willing to broaden the terms of our public discourse and grapple more explicitly with competing notions of the good life.

In hopes of avoiding sectarian strife, we often insist that citizens leave their moral and spiritual convictions behind when they enter the public square. But the reluctance to admit arguments about the good life into politics has had an unanticipated consequence. It has helped prepare the way for market triumphalism, and for the continuing hold of market reasoning.

In its own way, market reasoning also empties public life of moral argument. Part of the appeal of markets is that they don’t pass judgment on the preferences they satisfy. They don’t ask whether some ways of valuing goods are higher, or worthier, than others. If someone is willing to pay for sex, or a kidney, and a consenting adult is willing to sell, the only question the economist asks is “How much?” Markets don’t wag fingers. They don’t discriminate between worthy preferences and unworthy ones. Each party to a deal decides for him- or herself what value to place on the things being exchanged.

This nonjudgmental stance toward values lies at the heart of market reasoning, and explains much of its appeal. But our reluctance to engage in moral and spiritual argument, together with our embrace of markets, has exacted a heavy price: it has drained public discourse of moral and civic energy, and contributed to the technocratic, managerial politics afflicting many societies today.

A debate about the moral limits of markets would enable us to decide, as a society, where markets serve the public good and where they do not belong. Thinking through the appropriate place of markets requires that we reason together, in public, about the right way to value the social goods we prize. It would be folly to expect that a more morally robust public discourse, even at its best, would lead to agreement on every contested question. But it would make for a healthier public life. And it would make us more aware of the price we pay for living in a society where everything is up for sale.