A street sign for Wall Street hangs in front of the New York Stock Exchange
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What's behind Wall Street's optimism?

9 May 2013 Last updated at 08:07 BST

As Wall Street's record breaking run continues, some analysts wonder if it will be short lived.

The S&P 500 index closed last night at yet another all-time closing high and there was also a record high for the Dow Jones Industrial Average for the second day running.

Jeremy Howell investigates where the optimism may be coming from.