Chine numéro 1 mondial? Give us a break répond le site Investors.com

This just in from the International Monetary Fund: China could pass the United States as the world's largest economy as early as 2016. With all due respect, the IMF has it wrong again.

A new IMF report blithely forecasts that the "Age of America" will end as the U.S. economy is overtaken by China. And on the surface, it's tough to argue the point.

Officially, China's GDP is growing at 10% while ours is expanding at about 3%. At those rates, China's economy doubles every seven years, America's about every 24.

But such forecasts are based on a straight-line extrapolation from current trends: So if China's growing at 10% now, it'll always grow that fast.

One has to wonder, too, about a politically motivated IMF "report" that predicts U.S. decline. Our troubles are many, but we've heard all this before.

The fact is, China itself faces formidable hurdles that will make it tough to keep growing at current rates.

This was tacitly admitted by China just last month, when it announced it was lowering its targeted GDP growth rate to 7% a year — a full third slower than its recent growth rate.

Moreover, the IMF doesn't even use the correct data. It uses overall GDP, not per-capita GDP. Big difference. It would be surprising indeed if a nation of 1.3 billion — 20% of all people on earth — didn't eventually become the overall largest economy.

But real wealth and productivity are measured on a per-person basis. And based on that, China won't catch the U.S. anytime soon. In fact, it may never catch us.

As the chart shows, China is way behind the U.S. in per-person income. Per-capita GDP in the U.S. is $42,517 in 2005 dollars. In China, it's about $2,802. Even by 2030, China doesn't get close to U.S. per-person output, not even at current growth rates.

This is important, because per-capita GDP is a rough proxy for productivity. China has at most a few more years of rapid, productivity-driven growth as it transfers millions of people from rural poverty into its cities, where they instantly see their productivity increase by a factor of as much as 10.

But, as we've noted before, due to its notorious "one-child" policy, China is aging fast. By 2040, its elderly population will exceed the total population of Germany, France, Britain, Italy and Japan today.

The old saying among economists is that you have to get rich before you get old. China's losing that race.