When the government releases Friday’s employment report, nearly a million jobs could be erased. The change won’t show up in the monthly report. Rather, the expected drop will show up int he government’s revised job losses from April 2008 to March 2009, showing the labor market was in much worse shape than we knew at the time.
The revision comes every February. But this one, initially projected by the Labor Department to be -824,000, will be the biggest in 18 Years.
Blame the birth/death model for the revision. Built on years of research, the model's key assumption is fairly simple: most of the time jobs created at new companies make up for losses at companies that close.
Since the last boom began in 2003, the U.S. economy added just over 8 million jobs and subsequently lost about 8 million jobs in the recession. The birth/death model however, steadily forecasted new companies and new jobs, by an average of 55,000 a month.
In October, Keith Hall, Commissioner of the Bureau of Labor Statistics, said most of the coming revision "appears to be due in part to an increase in the number of business closings," short-circuiting the model's assumption that deaths are offset by births.
The Labor Department says there are flaws in its models and its monthly employment survey but it defends the process, saying the annual employment revisions are small and stable. That was true of most years since the birth/death model was first used in 2000. But not for the 2008 revision later this week.
That leaves economists and the rest of us to wonder what the error rate is from April 2009 onward - numbers that won't be revised until February of 2011. What we do know is the birth/death model has generated hundreds of thousands of jobs since April of last year - jobs which may get revised away in the final analysis.
Interactive Chart at Bloomberg
http://www.bloomberg.com/insight/birth-death-model.html