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.