Initially this “Great Accumulation” (as it became known) was undertaken as a means to protect emerging economies from the types of shocks that they experienced during the 1997-98 Asian Currency Crisis, in which emerging market central banks lacked the ammunition to support their free falling currencies through market intervention. It was hoped that large stockpiles of reserves would allow these banks to buy sufficient amounts of their own currencies on the open market, thereby stemming any steep falls. The accumulation was also used as a primary means for EM central banks to manage their exchange rates and prevent unwanted appreciation against the dollar while the Greenback was being depreciated through the Federal Reserve’s QE and zero interest rate policies.
http://www.infowars.com/get-ready-for-quantitative-tightening/
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