Strong currency is determined by strong country, and the status of a country's currency is supported by
its economic scale and comprehensive national strength. Years of double-digit growth has already made
China’s economy, in purchasing-power terms, the second largest in the world after the United States.
Since reform and opening up, China has grown to an international trading power. In 2007, China's
foreign trade share in world increased to 7.7%, and maintains third place in the world rankings. With
such a huge and well connected economic base, the opportunity for network externalities is
obvious(Benjamin J. Cohen, 2008).