labour economics

from 1947 to 2011. During the recession of 2009, the Employment Rate dropped dramatically (See Slide #7 in the slide-deck). The rate has not rebounded as quickly as it historically would after a steep decline. More than 10 years later, we have not recovered to the rates seen between the lat '90's and the recession. What explanation is there for why this has occurred? Look to articles on the web for information and provide your own interpretation of the root cause(s). Their is no article which I nd on internet for thal so I need help just 7 to 8 lines so that I can understand why thanks