Virginia Postrel writes in the Sunday New York Times Magazine about just one of the problems with labor statistics.
The official job counters at the Bureau of Labor Statistics don’t do much to overcome our blind spots. The bureau is good at counting people who work for large organizations in well-defined, long-established occupations. It is much less adept at counting employees in small businesses, simply because there are too many small enterprises to representatively sample them. The bureau’s occupational survey, which might suggest which jobs are growing, doesn’t count self-employed people or partners in unincorporated businesses at all. And many of today’s growing industries, the ones adding jobs even amid the recession, are comprised largely of small companies and self-employed individuals.