Currency Manipulation

Accusations of currency manipulation are causing tension between the U.S and China it will be a hard hitting topic in this week's G-20 gathering in Seoul.

So what is currency manipulation? And why does it matter?“By selling its own currency and buying up foreign reserves like the U.S. dollar, China has essentially pegged the yuan's value to the dollar instead of allowing it to move freely in foreign exchange markets.” 

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http://money.cnn.com/2010/11/10/news/economy/what_is_currency_manipulation/index.htm?source=yahoo_app