Third, and perhaps most important, a modern economy requires “collective action”—it needs government to invest in infrastructure, education, and technology. The United States and the world have benefited greatly from government-sponsored research that led to the Internet, to advances in public health, and so on. But America has long suffered from an under-investment in infrastructure (look at the condition of our highways and bridges, our railroads and airports), in basic research, and in education at all levels. Further cutbacks in these areas lie ahead.

None of this should come as a surprise—it is simply what happens when a society’s wealth distribution becomes lopsided. The more divided a society becomes in terms of wealth, the more reluctant the wealthy become to spend money on common needs. The rich don’t need to rely on government for parks or education or medical care or personal security—they can buy all these things for themselves. In the process, they become more distant from ordinary people, losing whatever empathy they may once have had. They also worry about strong government—one that could use its powers to adjust the balance, take some of their wealth, and invest it for the common good. The top 1 percent may complain about the kind of government we have in America, but in truth they like it just fine: too gridlocked to re-distribute, too divided to do anything but lower taxes.

Economists are not sure how to fully explain the growing inequality in America. The ordinary dynamics of supply and demand have certainly played a role: laborsaving technologies have reduced the demand for many “good” middle-class, blue-collar jobs. Globalization has created a worldwide marketplace, pitting expensive unskilled workers in America against cheap unskilled workers overseas. Social changes have also played a role—for instance, the decline of unions, which once represented a third of American workers and now represent about 12 percent.

But one big part of the reason we have so much inequality is that the top 1 percent want it that way. The most obvious example involves tax policy. Lowering tax rates on capital gains, which is how the rich receive a large portion of their income, has given the wealthiest Americans close to a free ride. Monopolies and near monopolies have always been a source of economic power—from John D. Rockefeller at the beginning of the last century to Bill Gates at the end. Lax enforcement of anti-trust laws, especially during Republican administrations, has been a godsend to the top 1 percent. Much of today’s inequality is due to manipulation of the financial system, enabled by changes in the rules that have been bought and paid for by the financial industry itself—one of its best investments ever. The government lent money to financial institutions at close to 0 percent interest and provided generous bailouts on favorable terms when all else failed. Regulators turned a blind eye to a lack of transparency and to conflicts of interest.

When you look at the sheer volume of wealth controlled by the top 1 percent in this country, it’s tempting to see our growing inequality as a quintessentially American achievement—we started way behind the pack, but now we’re doing inequality on a world-class level. And it looks as if we’ll be building on this achievement for years to come, because what made it possible is self-reinforcing. Wealth begets power, which begets more wealth. During the savings-and-loan scandal of the 1980s—a scandal whose dimensions, by today’s standards, seem almost quaint—the banker Charles Keating was asked by a congressional committee whether the $1.5 million he had spread among a few key elected officials could actually buy influence. “I certainly hope so,” he replied. The Supreme Court, in its recent Citizens United case, has enshrined the right of corporations to buy government, by removing limitations on campaign spending. The personal and the political are today in perfect alignment. Virtually all U.S. senators, and most of the representatives in the House, are members of the top 1 percent when they arrive, are kept in office by money from the top 1 percent, and know that if they serve the top 1 percent well they will be rewarded by the top 1 percent when they leave office. By and large, the key executive-branch policymakers on trade and economic policy also come from the top 1 percent. When pharmaceutical companies receive a trillion-dollar gift—through legislation prohibiting the government, the largest buyer of drugs, from bargaining over price—it should not come as cause for wonder. It should not make jaws drop that a tax bill cannot emerge from Congress unless big tax cuts are put in place for the wealthy. Given the power of the top 1 percent, this is the way you would expect the system to work.