Why 5.5 percent unemployment isn’t as great as it seems

isis group Perrier branded cargowaggon 23 80 292 9 006-7
ISIS
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isis group Perrier branded cargowaggon pair number 23 80 292 9 006-7 hauled by class 66 number 077 from Wembley to Dollands Moor on 24 April 2014.

Unemployment in the U.S. has dropped to a seven-year low of 5.5 percent – a level normally considered the mark of a healthy job market. Yet that number isn't as encouraging as it might sound.
MyFox Washington DC – U.S. & World – headline