Zing!

Greg Mankiw:

The inconsistency in the policy here becomes fully apparent only when one understands how China "manipulates" its currency: It keeps the value of the yuan lower than it otherwise might be by supplying yuan and demanding dollars in foreign-exchange markets. Those dollars are then invested in U.S. Treasuries.

In other words, Secretary Clinton is now asking the Chinese to do precisely what Secretary Geithner asked them not to do.

My emphasis.