Stan,

Good question. The BRICS countries have been experiencing rather different growth trajectories in recent years. World Bank estimates put the GDP growth rate of Brazil, Russia, South Africa next year at below US levels, so they will not be major contributors to global economic growth.
The PBOC does have currency swap agreements in place with many other central banks. If that's what you are referring to, it would not systematically bias China's GDP numbers.

Thanks for visiting our blog and sharing your comments!

Larry