Beijing swells dollar reserves through stealth

A study by HSBC's currency team in Asia has concluded that China's central bank is in effect forcing commercial banks to build up large dollar reserves, using them as arms-length proxies in a renewed campaign of exchange rate intervention.

Beijing has raised the reserve requirement for banks five times since March, quickening the pace with two half-point rises in late June.

This is having major spill-over effects into the currency markets because banks in China have been required over the last year to hold extra reserves in dollars rather than yuan. The latest moves have lifted the mandatory deposit from 15pc to 17.5pc of total lending since March.

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Given the sheer scale of China's foreign reserves - now $1,800bn (£970bn) - any shift in its exchange policy now ripples around the globe. The covert buying may help to explain at least part of the explosive dollar rebound over recent weeks.