The NBER said today that the recession which began in December 2007 ended in June 2009, which marked the beginning of an expansion. The announcement rules out the possibility of a so-called “double-dip” recession, because any new downturn would be seen as a brand new recession.
It is not usual to have a lag between the end of a recession and the official declaration of the end. However, a lag of more than one year like the current one is not common either. It reflects the unusual weakness of economic recovery that the US economy is experiencing right now.