An exodus of discouraged workers from the job market kept the unemployment rate from climbing above 10 percent. Had the labor force not decreased by 661,000 , the unemployment rate would have been 10.4 percent. The number of discouraged workers rose to 929,000 last month. Source: Bloomberg, January 9,2010
What is a discouraged worker? Explain how an increase in discouraged workers influences the official unemployment rate and $\mathrm{U}-4$