A frequent meme propounded in the economic blogosphere is that U6 unemployment, running near 17% now, is a truer measure (and there are good reasons to believe it is), so that means we have unemployment already approaching Great Depression levels of 25%. Left out of the comparison is the fact that U3 and U6 measurements didn't exist during the 1930s. So, is the 25% unemployment peak for the Great Depression a fair comparison to U6 unemployment today?
N. Andrews compared historical versions of unemployment statistics with the modern U3 and U6 versions, published as "Historical Unemployment in Relationship to Today" , has an answer. He writes:
For the period of 1900 - 1947 we have two unemployment statistics available, Unemployed Non-Farm employees and Unemployed Civilian Workforce. These two data sets pose a challenge as they were developed during a period of ever-changing data collection methodologies. The data in the sets has been adjusted by the sources listed in Bicentennial Edition: Historical Statistics of the United States, Colonial Times to 1970 in an attempt to sync the data sets with the methodology that was put in place as of 1940 and was the basis for methodologies since. We can compare the two available data sets ... and we see that the Unemployed Non-Farm employees and Unemployed Civilian Workforce measures of unemployment appear to be a close analogue of modern U3 (Unemployed Civilian Workforce) and U6 (Non-Farm employees).
Based on that research, he was able to generate a mathematical formula to calculate U3 and U6 unemployment for the entire period since 1900. He found that at the peak of the Great Depression, U3 was 25.2%. U6 was 37.6%.
Here's the resulting graph:
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