The Census was able to reverse a decades-long decline in survey response rates with its 2010 count.

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In response to Thursday's report, the government pledged "to reverse decades of lax inventory management".

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Giving his first parliamentary response to the Budget on 22 March 2012, Mr Balls pledged to reverse the decision if Labour were to fight a general election.

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If the purchases are a response to government pricing policies, it could leave global prices vulnerable should those policies reverse.

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One potential response would be for the Fed to purchase even more mortgage-backed bonds in an effort to reverse yields.

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