下面是一篇关于美国经济复苏的雅思阅读材料，这篇雅思阅读材料的主要内容是虽然美国的经济正在复苏，但是，美国人的信心仍然深陷在经济危机当中没有回复。在2月份的一次对于世界经济的领导力量的调查中，大多数人选择了中国。所以美国的经济复苏虽然充满了想法，但是还需付出实践。
Still full of ideas, but not making jobs
Americaneeds to share the benefits of innovation more widely
THE economy is recovering, yet American confidence remains mired at levels more commonly seen in recessions. For that blame unemployment, petrol prices and a deeper, nagging feeling that America is in decline. A Gallup poll in February asked Americans to name the world's leading economic power. By a significant margin, they said China.
Barack Obama has exploited this anxiety. America, he has said, faces a new "Sputnik moment" and must "compete for the jobs and industries of our time" by spending more on research, education and infrastructure. But the notion that America is on the verge of being vanquished by cleverer, more innovative competitors is flawed. First, competitiveness is a woolly concept that wrongly supposes countries, like football teams, win only when another team loses. But one country's economic growth does not subtract from another's. Second, America's ability to innovate and raise productivity remains reasonably healthy. The problem is that the benefits of that innovation and productivity have become so narrowly concentrated that workers'median wages have stagnated.
Towards the end of the last decade American productivity began to slump, a sign to some that the pay-off from new information technology had largely been exhausted. But coming out of the recession productivity surged; it rose by 3.9% last year, the fastest rate since 2002. This was largely cyclical, since business output has recovered more quickly than hiring. Long-term productivity growth will be more modest, and its rate will depend on investment, human capital and innovation.
After collapsing during the recession, investment in business equipment has bounced back, rising 17% in the last quarter of 2010 from the figure a year earlier. Human capital is more of a challenge. Americans once led the world in educational attainment, but this is now barely rising while other countries have caught up (see article). That is a key reason why Dale Jorgenson, an economist at Harvard University, reckons overall productivity growth will average 1.5% in the coming decade, down from 2% in the previous two.
Innovation is what preoccupies Mr Obama. He worries that the next breakthroughs in energy, transport and information technology will occur elsewhere. His advisers fret that federal research and development has fallen sharply since the Sputnik era. But the picture is more encouraging once private R&D is included. In 2008, the most recent year for which data are available, total R&D was 2.8% of GDP, near the top of its historical range (see chart). American patent applications tailed off during the recession, but only after doubling in the decade before.