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Edited on Fri Jan-14-11 08:33 AM by pinqy
Brief run through of the concepts: Population is the Adult Civilian Non-Institutional Population: Everyone 16 years and older, not in prison, a mental institute, or the military (the Levitan Commission reccomended including the military and that was done 1984-1994, but the figure including the military was usually ignored in favor of the civilian figures, so it was dropped).
Labor Force are those participating in the labor market: Employed and Unemployed, with Employed people who worked, and Unemployed people actively seeking work.
Not in the Labor Force is everyone else in the Population.
So the Labor Force participation rate is the percentage of the Population who are in the Labor Force. At its height in Dec 2006, there were 145,970,000 employed and 6,762,000 unemployed for a Labor Force of 152,732,000 and a Population of 230,108,000. 152,732,000/230,108,000= 0.664 66.4% With a Employment to Population ratio of 63.4% and an unemployment rate of (6,762,000/230,108,000= 0.44) 4.4%
For Dec 2010, there were 139,206,000 employed, 14,485,000 unemployed for a Labor Force of 153,690,000, higher than in 2006, but the Population grew to 238,889,000 giving a ratio of 153,690,000/238,889,000= 64.3% Employment to Population dropped more, to 58.3% and Unemployment rate is 9.4%
In short, while the population grew, employment went down, unemployment went up, and the labor force grew, but not by as much as the population. Definitely not a good thing as it means that as the population grew, fewer people were trying to work. What the OP is trying to do is say that IF the LF participation rate was still 66.4%, that would be a Labor Force of around 158,622,000 and if we assume that all the people we have to add in to the LF to get 66.4% were categorized as Unemployed, then the rate would be much higher.
Now all that's true, but misleading. For example, when my mother worked full time, she was a secondary earner to my father...she didn't really need to work, just worked a min wage job to get out of the house and have pocket money. She quit and became Not in the Labor Force. That kind of situation, and students and retirees with part time jobs etc, would definitely occur more often in a recession with people who don't necessarily need to work getting forced out of the labor market and not wanting to get back in. It's a bad assumption then, to add them back in as unemployed.
Let's look further...there are 6,471,000 people who are Not in the Labor Force but say they want a job. Adding them in would boost the UE rate to 13.1% and the LF participation rate to 67%. But not all those people could actually take a job if offered. And how many people are serious about wanting a job? If someone says they want to work, but aren't trying, is that really the same as someone actually trying? And because categories such as "want a job now" and "Discouraged" and "Marginally Attached" are so subjective...you can have 2 people in identical circumstances categorized differently solely on their perceptions/beliefs or just how they frame their response...the margin of error gets large (Labor force level is +-0.2%, want a job now is +-2.1%)
As for population controls...all these numbers are estimates, based on a sample of 60,000 households. Over time, with more information, the numbers can be crunched to be more accurate..you have a baseline figure and each month you can estimate the changes and add those to the baseline. But if the baseline is off (and there's a real margin of error) then the subsequent numbers will be more and more off. So periodically, the numbers are adjusted to match better estimates of previous times. The 2010 census will help that a lot.
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