Joseph Stiglitz hits the income inequality nail on the head, by @DavidOAtkins

Politicians typically talk about rising inequality and the sluggish recovery as separate phenomena, when they are in fact intertwined. Inequality stifles, restrains and holds back our growth. When even the free-market-oriented magazine The Economist argues — as it did in a special feature in October — that the magnitude and nature of the country’s inequality represent a serious threat to America, we should know that something has gone horribly wrong. And yet, after four decades of widening inequality and the greatest economic downturn since the Depression, we haven’t done anything about it.

There are four major reasons inequality is squelching our recovery. The most immediate is that our middle class is too weak to support the consumer spending that has historically driven our economic growth. While the top 1 percent of income earners took home 93 percent of the growth in incomes in 2010, the households in the middle — who are most likely to spend their incomes rather than save them and who are, in a sense, the true job creators — have lower household incomes, adjusted for inflation, than they did in 1996. The growth in the decade before the crisis was unsustainable — it was reliant on the bottom 80 percent consuming about 110 percent of their income.

Second, the hollowing out of the middle class since the 1970s, a phenomenon interrupted only briefly in the 1990s, means that they are unable to invest in their future, by educating themselves and their children and by starting or improving businesses.

Third, the weakness of the middle class is holding back tax receipts, especially because those at the top are so adroit in avoiding taxes and in getting Washington to give them tax breaks. The recent modest agreement to restore Clinton-level marginal income-tax rates for individuals making more than $400,000 and households making more than $450,000 did nothing to change this. Returns from Wall Street speculation are taxed at a far lower rate than other forms of income. Low tax receipts mean that the government cannot make the vital investments in infrastructure, education, research and health that are crucial for restoring long-term economic strength.

Fourth, inequality is associated with more frequent and more severe boom-and-bust cycles that make our economy more volatile and vulnerable. Though inequality did not directly cause the crisis, it is no coincidence that the 1920s — the last time inequality of income and wealth in the United States was so high — ended with the Great Crash and the Depression. The International Monetary Fund has noted the systematic relationship between economic instability and economic inequality, but American leaders haven’t absorbed the lesson.

There are all kinds of excuses for inequality. Some say it’s beyond our control, pointing to market forces like globalization, trade liberalization, the technological revolution, the “rise of the rest.” Others assert that doing anything about it would make us all worse off, by stifling our already sputtering economic engine. These are self-serving, ignorant falsehoods.

Market forces don’t exist in a vacuum — we shape them. Other countries, like fast-growing Brazil, have shaped them in ways that have lowered inequality while creating more opportunity and higher growth. Countries far poorer than ours have decided that all young people should have access to food, education and health care so they can fulfill their aspirations.

Our legal framework and the way we enforce it has provided more scope here for abuses by the financial sector; for perverse compensation for chief executives; for monopolies’ ability to take unjust advantage of their concentrated power...

Globalization, and the unbalanced way it has been pursued, has shifted bargaining power away from workers: firms can threaten to move elsewhere, especially when tax laws treat such overseas investments so favorably. This in turn has weakened unions, and though unions have sometimes been a source of rigidity, the countries that responded most effectively to the global financial crisis, like Germany and Sweden, have strong unions and strong systems of social protection.

As Mr. Obama’s second term begins, we must all face the fact that our country cannot quickly, meaningfully recover without policies that directly address inequality. What’s needed is a comprehensive response that should include, at least, significant investments in education, a more progressive tax system and a tax on financial speculation.