The Bureau of Labor Statistics counts six levels of unemployment (you can find a great deal of info at bls.gov if you are interested):
Since I've worked professionally with these numbers for over ten years, I can assure you I am quite familiar with them. And your definitions are a little off.
- U3: Official unemployment rate per ILO definition.
Mostly. The ILO definition has a maximum age of 65 and includes the military, while the U3 has no maximum age and excludes the military (the U5 did, from 1984-1994, though the seperate civilian rate was generally preferred)
- U4: U3 + "discouraged workers", or those who have stopped looking for work because current economic conditions make them believe that no work is available for them.
There's some subtlety here...it's not so much that economic conditions make them believe, but rather they believe they will not find work, either due to their perception of economic conditions or simply personal circumstances. Your phrasing makes it sound more objective. And since 1994 the criteria is that they must have looked for work sometime in the previous 12 months.
- U5: U4 + other "marginally attached workers", or "loosely attached workers", or those who "would like" and are able to work, but have not looked for work recently.
You've got that one right, though again there's a 12 month limit. The important thing with the Marginally attached is that it can be for any reason at all that they haven't been looking. Which is fine for looking at potential workers, bad for an objective look at actual labor market conditions.
- U6: U5 + Part time workers who want to work full time, but cannot due to economic reasons (underemployment).
Correct, though it's a little more subtle...there are 2 categories of part time for economic reasons...<35 hrs/week due to slack work/slow business conditions, and <35 hrs/week to to inability to find a part time job. About 2/3s of part time for economic reasons is slack work/slow business.
[qutoe]I believe that U6 is more useful because it provides a fuller perspective of the true human cost of under and unemployment. [/quote]It is more useful for that...which is why it's calculated. But it is NOT true unemployment (because it includes some employed) and does not give an objective view of the labor market...what the actual market conditions are.
Someone who has given up looking due to lack of jobs in his area is suffering as much as someone who is still looking;
Are we trying to measure suffering? Or are we trying to measure the labor market? There are many more people suffering through jobs they dislike, lower pay than they'd like, etc. We can't measure that in any objective manner.
someone who has taken a low paying part time job to make ends meet is not fully employed.
True, but how would you actually quantify that? Most of the part time for economic reasons are people who have had a temporary drop in hours, which is certainly an important thing to track, but it is not the same thing as taking a low paying part time job to make ends meet.
The cost to our society and the affected individuals of this much fallow productivity is enormous.
Of course...but that doesn't make it more "real" and it is certainly less accurate because it's a lot more subjective. Of the components of the U3, the Unemployment level margin of error is currently +-2.2% and Employment is +-0.4%. Discouraged workers is +-8.3%, part time for economic reasons is +-3%. So to get the broader picture, you're sacrificing accuracy.
Now it's fine if you consider the U6 more useful for the purposes of overall "suffering," but that doesn't make it more "real" or more useful for measuring the labor market, which is the purpose of the U3. A screwdriver makes a poor hammer, but it's not meant to be used as a hammer...same thing with these stats...the U3 isn't supposed to measure "suffering" so it's unfair to judge it by that.