How to Shrink Inequality

3) Invest in education. This investment should extend from early childhood through world-class primary and secondary schools, affordable public higher education, good technical education and lifelong learning. Education should not be thought of as a private investment; it is a public good that helps both individuals and the economy. Yet for too many Americans, high-quality education is unaffordable and unattainable. Every American should have an equal opportunity to make the most of herself or himself. High-quality education should be freely available to all, starting at the age of 3 and extending through four years of university or technical education.

4) Invest in infrastructure. Many working Americans -- especially those on the lower rungs of the income ladder -- are hobbled by an obsolete infrastructure that generates long commutes to work, excessively high home and rental prices, inadequate Internet access, insufficient power and water sources, and unnecessary environmental degradation. Every American should have access to an infrastructure suitable to the richest nation in the world.

5) Pay for these investments with higher taxes on the wealthy. Between the end of World War II and 1981 (when the wealthiest were getting paid a far lower share of total national income), the highest marginal federal income tax rate never fell below 70 percent, and the effective rate (including tax deductions and credits) hovered around 50 percent. But with Ronald Reagan's tax cut of 1981, followed by George W. Bush's tax cuts of 2001 and 2003, the taxes on top incomes were slashed, and tax loopholes favoring the wealthy were widened. The implicit promise -- sometimes made explicit -- was that the benefits from such cuts would trickle down to the broad middle class and even to the poor. As I've shown, however, nothing trickled down. At a time in American history when the after-tax incomes of the wealthy continue to soar, while median household incomes are falling, and when we must invest far more in education and infrastructure, it seems appropriate to raise the top marginal tax rate and close tax loopholes that disproportionately favor the wealthy.

6) Make the payroll tax progressive. Payroll taxes account for 40 percent of government revenues, yet they are not nearly as progressive as income taxes. One way to make the payroll tax more progressive would be to exempt the first $15,000 of wages and make up the difference by removing the cap on the portion of income subject to Social Security payroll taxes.

7) Raise the estate tax and eliminate the "stepped-up basis" for determining capital gains at death. As Piketty warns, the United States, like other rich nations, could be moving toward an oligarchy of inherited wealth and away from a meritocracy based on labor income. The most direct way to reduce the dominance of inherited wealth is to raise the estate tax by triggering it at $1 million of wealth per person rather than its current $5.34 million (and thereafter peg those levels to inflation). We should also eliminate the "stepped-up basis" rule that lets heirs avoid capital gains taxes on the appreciation of assets that occurred before the death of their benefactors.

8) Constrain Wall Street. The financial sector has added to the burdens of the middle class and the poor through excesses that were the proximate cause of an economic crisis in 2008, similar to the crisis of 1929. Even though capital requirements have been tightened and oversight strengthened, the biggest banks are still too big to fail, jail or curtail -- and therefore capable of generating another crisis. The Glass-Steagall Act, which separated commercial- and investment-banking functions, should be resurrected in full, and the size of the nation's biggest banks should be capped.

9) Give all Americans a share in future economic gains. The richest 10 percent of Americans own roughly 80 percent of the value of the nation's capital stock; the richest 1 percent own about 35 percent. As the returns to capital continue to outpace the returns to labor, this allocation of ownership further aggravates inequality. Ownership should be broadened through a plan that would give every newborn American an "opportunity share" worth, say, $5,000 in a diversified index of stocks and bonds -- which, compounded over time, would be worth considerably more. The share could be cashed in gradually starting at the age of 18.

10) Get big money out of politics. Last, but certainly not least, we must limit the political influence of the great accumulations of wealth that are threatening our democracy and drowning out the voices of average Americans. The Supreme Court's 2010 Citizens United decision must be reversed -- either by the Court itself, or by constitutional amendment. In the meantime, we must move toward the public financing of elections -- for example, with the federal government giving presidential candidates, as well as House and Senate candidates in general elections, $2 for every $1 raised from small donors.

Building a Movement

It's doubtful that these and other measures designed to reverse widening inequality will be enacted anytime soon. Having served in Washington, I know how difficult it is to get anything done unless the broad public understands what's at stake and actively pushes for reform.

That's why we need a movement for shared prosperity -- a movement on a scale similar to the Progressive movement at the turn of the last century, which fueled the first progressive income tax and antitrust laws; the suffrage movement, which won women the vote; the labor movement, which helped animate the New Deal and fueled the great prosperity of the first three decades after World War II; the civil rights movement, which achieved the landmark Civil Rights and Voting Rights acts; and the environmental movement, which spawned the National Environmental Policy Act and other critical legislation.

Time and again, when the situation demands it, America has saved capitalism from its own excesses. We put ideology aside and do what's necessary. No other nation is as fundamentally pragmatic. We will reverse the trend toward widening inequality eventually. We have no choice. But we must organize and mobilize in order that it be done.

[This essay appears in the current edition of "The Nation."]