U.S. Employment : Why wage had hardly risen since financial crisis

Let's see employment condition in U.S. divided in ages.
Job gainers are the younger and the older only. Many of the younger would be part-timers and the older's jobs may be lower-wage jobs.

But, jobs in prime ages have increased even though it's pace has been very moderate.
And recent upward pressure for wage may signal for solid employment condition for them further.

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