How Central Banks Move the Forex Market

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Central banks participate in the forex market to fix the value of its currency to a particular level.  Central banks will intervene in the forex market when their currency gets too weak or to strong.  They will also enter into this market to protect other currencies in order to prevent their floating rate loans (which are tied to foreign currency).

The Bank of Japan is notorious for their intervention in the forex market to protect their net exporter status.