单选题根据下面资料，回答题 Rising Inequality Is Holding Back the U. S. Economy [A] In announcing his run for the presidency last month, Jeb Bush has set an ambitious goal of 4 percent real growth in gross domestic product (GDP). This goal has been greeted with substantial skepticism from parts of the economics establishment, while some economists have praised it as a "worthy and viable aspiration" that could be achieved with growth-oriented policies. Our recent research implies that a 4 percent growth goal for first term of the next President is not only possible, but is what we should strive to achieve. Like Hubbard and Warsh, veteran Republican economic policymakers, we agree that the U. S. needs policies that raise labor force participation,accelerate productivity growth and improve expectations. Where we part ways is the tactics. [B] Their recommendations focus on supply-side policies, such as tax reform, regulatory reform, reduced trade friction and education and training. Our research implies that a weak demand side explains the sluggish (萧条的) recovery from the Great Recession, with the rise of income inequality as a central factor. Consequently, our policy prescriptions revolve around increasing the take-home pay of the majority of American households. The Great Recession, which began in December 2007, was the most severe American economic downturn in three-quarters of a century. Most economists did not anticipate ahead of time that this kind of thing could happen, although we warned that "it could get ugly out there" in October 2007. [C] But as the severity of the recession became apparent in the dark days of late 2008 and early 2009, many economists predicted a swift bounce-back, reasoning from historical evidence that deep downturns are followed by rapid recoveries. Sadly, that prediction was also incorrect. The growth path following the Great Recession has been historically sluggish. Our recent research, supported by the Institute for New Economic Thinking, helps explain why: The economic drag from decades of rising income inequality has held back consumer spending. [D] Our work studies the link between rising income inequality and U. S. household demand over the past several decades. From the middle 1980s until the middle 2000s, American consumers spent liberally despite the fact that income growth stagnated (停滞) for most of the population. We show that the annual growth rate of household income slowed markedly in 1980 for the bottom 95 percent of the income distribution, while income growth for the top 5 percent accelerated at the same time. The result was the widely discussed rise of income inequality. [E] It is also well known that household debt grew rapidly during this period. Our work points out that the buildup of debt relative to income was concentrated in the bottom 95 percent of the income distribution. Debt to income for the top 5 percent bounced around with little clear trend: When the financial crisis hit, our work shows that the bottom 95 percent of Americans could no longer get the rising debt they needed to continue to spend along the trend they established in the years leading up to the crisis. The result was a sharp cutback in household demand relative to income that caused the collapse of the Great Recession. [F] What about the recovery? Household demand in 2013 (the most recent observation we have because our computations incorporate data that are released with a lag and are available at an annual frequency only) was a stunning 17.5 percent below its pre-recession trend, with no sign of recovering back toward the trend, what happened? Our research implies that the cutoff of credit for the group of households falling behind as income inequality rose prevented their spending from recovering to its pre-recession path. [G] While there is no reason to necessarily expect that consumer spending will follow a constant trend over long periods of time, the practical reality is that the U. S. economy needed the pre-recession trend of demand to maintain adequate growth and at least a rough approximation of full employment prior to 2007. In the middle 2000s, there was no sign of excess demand in the U.S. economy. Inflation was tame and interest rates were low. Wage growth was stagnant. Although some gradual slowing in long-term U. S. growth might have been predicted as the large baby-boom generation ages, the overall labor force participation rate was actually rising prior to the recession, so there was no reason to expect any significant decline in labor resources in the years immediately following 2007. [H] Yes, the way many Americans were financing their demand was unsustainable, but there is no indication that businesses could not sustainably continue to produce along the pre-recession trend if they had been able to sell the output. Our interpretation of the evidence is that the demand drag that could be expected as the result of rising inequality is, after a delay of a-quarter century, finally constraining the U. S. economy. Intuition, theory and evidence predict that high-income people spend, on average, a smaller share of their income than everyone else does. So as a higher share of income goes into the pockets of the well-to-do, the household sector as a whole is likely to recycle less of its income back into spending, which slows the path of demand growth. [I] A possible problem with this prediction for the U. S. in recent years is that income inequality began to rise in the early 1980s, but household demand remained strong through 2006. Our argument is that the demand drag from rising inequality was postponed by the buildup of debt: The bottom 95 percent borrowed rather than cut back their spending when their income growth slowed. But as the crisis hit, lending to households collapsed, and the trend of rising debt could not continue. [J] The effect of rising inequality has hit the economy hard. As a result, today's economy is underperforming. No one can know precisely how much of the stagnation in household demand is due to the rise of inequality, but our estimates imply that the current path of total demand in the economy is at least 10 percent below where it would have been with the income distribution of the early 1980s. Where demand goes, so follows output and employment. This analysis links to the call for 4 percent growth. Considering conventional estimates of the long-term trend growth of the economy, a 4 percent growth rate through the next U. S. President's first term would go a long way toward closing the gap in output that opened with the collapse of household spending in the Great Recession and has yet to be filled. [K] How can we move toward this goal? Our research strongly implies that the main problem is on the demand side, not the supply side. The U. S. needs to find a way to boost demand growth by arresting, and hopefully reversing, the dramatic rise of inequality. The basic argument is exceedingly simple: The economy continues to be held back by insufficient household spending, and if the income share of Americans outside of the top sliver rises, household spending will increase. Policies that raise the minimum wage and reduce the tax burden of low- and middle-income households would help. [L] In our view, however, the best method to achieve this objective would be to restore wage growth across the income distribution as occurred in the decades after World War Ⅱ. Meeting this objective is challenging for a variety of reasons, including the fact that there remains no clear consensus about what has caused the rise of American economic inequality. But the need to address inequality is not just a matter of social justice; it also is important to get the economy back on the right track after more than seven years of stagnation. We can do better. Americans were free with their money though their income growth mostly remained still from the late 20th century to the early 21st century.