Why doesn't America's "4.9%" unemployment rate feel great?

``During the worst of the Great Recession, 6.8 million people were long-term unemployed. So there's been improvement, but there are still roughly double the number of long-term unemployed than in normal times... [and] wage growth is only 2.5% a year. As Sharon Stark of D.A. Davidson notes, normally when unemployment is this low, wage growth should be humming along at about 4% a year.''