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Occupy Wall Street protester Yoni Miller, right, hands out flyers to people at the corner of Wall Street and Nassau Street, across the street from the New York Stock Exchange.

ANDREW BURTON/REUTERS

U.S. President Barack Obama recently committed himself and his administration to fighting the scourge of income inequality. Indeed, it is not a moment too soon to focus on this issue.

This U.S. recovery has been incredibly unequal, with the incomes of the richest 1 per cent growing robustly, while the bottom 99 per cent are stagnant. For a long time, few economists – even those concerned about inequality – have thought about this topic in the context of macroeconomic policy.

As it turns out, high and rising levels of inequality may well be a cause of increased macroeconomic instability. But the negative spiral doesn't end there: High inequality also contributes to a fraying of the political consensus, is associated with boom-bust credit cycles and may ultimately lead to a chronic weakness of economic demand.

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The United States is now caught in a vicious cycle. The cycle starts with stagnant incomes and a biting credit constraint at the middle and low end of the income distribution. As dramatically exemplified by the large numbers of continuing and still unresolved home foreclosures, this has led to low expectations for effective demand growth – and therefore low business investment in the U.S. economy at large.

The Federal Reserve Board has been trying to stimulate demand via monetary policy with very low interest rates or "quantitative easing," or with both. However, these measures have been of dubious efficacy. According to the old adage: "You can lead a horse to water, but you can't make it drink."

In addition, there is a pronounced risk of reigniting an unsustainable borrowing process. The bottom 90 per cent of U.S. households, with incomes still stagnant, is not yet in a considerably better position to borrow. Yet this is what is heralded – whether to pump up car sales or whatever else.

Moreover, very low interest rates may themselves worsen the distribution of income in the United States. How so? They lead to low or negative real returns for a large number of small savers, while they reduce the cost of borrowing by companies that are owned disproportionately by relatively wealthy individuals.

So companies can borrow at zero real rates and invest at much higher returns. Also, stock prices have been rising dynamically, benefiting all those with a stock market portfolio. However, most people in the lower 90 per cent of U.S. households don't have any sizable portfolios.

In the meantime, the option to pursue an expansionary fiscal policy (for example, by spending more on infrastructure) as well as increased spending on unemployment benefits (and other elements of the social safety net) are constrained by concerns about rising public debt.

The United States may thus have reached a point where the classic arsenal of countercyclical policies has become much less effective. To an appreciable degree, this grave problem is due to what has become a structural form of income concentration that initially helped trigger the Great Recession, and now limits a sustainable growth path in broad-based private demand.

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If this interpretation is correct, then it is the rebalancing of the distribution of income within the United States that would play a key role in unlocking the U.S. economy's growth potential in a sustainable way.

This kind of internal rebalancing stands in stark contrast to the global rebalancing that is so often touted by the U.S. Treasury and many mainstream economists as the solution to the nation's current woes.

Because the United States is a large economy relatively less exposed to the global economic cycle (exports only represent about 12 per cent of gross domestic product), the idea that, for example, expansion of demand in China could play a big role in reigniting U.S. growth was always far-fetched.

Estimates of fiscal stimulus multipliers in the United States and elsewhere provide strong evidence in support of the view that increasing the purchasing power of those at the lower end of the income spectrum could make a real difference.

Social balancing programs – such as the Earned Income Tax Credit, food stamps, unemployment benefits and work-share – provide transfers to boost the incomes of low-income or unemployed groups.

These instruments are believed to be four to five times as effective in stimulating demand as policies that benefit high-income groups, such as tax cuts for those with high incomes, for corporations and in the capital gains arena.

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This is not a new insight. It was Henry Ford who recognized that it made sense to pay his workers enough so they, too, could buy the cars they produced.

An economy such as that of the United States, where nearly all of the income growth accrues to the very rich, is unlikely to generate a corresponding growth in broad-based demand – especially after the Great Recession ravaged the credit scores of a large part of its middle class and poor.

Kemal Dervis directs the Global Economy and Development program at the Brookings Institution and Uri Dadush leads the International Economics program at the Carnegie Endowment. They are contributors to The Globalist (theglobalist.com), where this article first appeared. Copyright The Globalist.

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