About a quarter of the world's economic output is produced by the United States, whose population is less than a fourth of China's 1.3 billion. So there's a very long way to catch up for a country beset by a variety of Third World problems, from lack of paved roads in many rural areas to water pollution so severe that 700 million people have to drink contaminated water every day, according to the World Bank.
via Goodbye America, Hello China? Think again!- International Business-News-The Economic Times.