Measuring Employment Slack: A Key Metric

 | Apr 28, 2014 12:54AM ET

Recently definition of participation rate , it should be an excellent metric of employment slack.

Labor force (Current Population Survey): The labor force includes all persons classified as employed or unemployed in accordance with the definitions contained in this glossary.

Labor force participation rate: The labor force as a percent of the civilian noninstitutional population.

Simple - right? You figure out who is in the labor force by determining who is employed and unemployed (which would exclude anyone who was not looking for a job), then divide this work force number by the population. The details devil is in the historical look at what really happens. 

Historically the participation rate is miraculously hardly ever affected the way that employment is by a recession. How do I know? Look at the chart below comparing participation rates to employment population ratios.