So how important are these two forms of unemployment? Justin Weidner and John C. Williams of the San Francisco Fed have a note that helps answer this question. In the note the authors look at the various measures of the output gap and via Okun's Law, the implied natural rate of unemployment. Now the natural rate of unemployment is the sum of frictional unemployment and structural unemployment. Frictional unemployment, which is a function of search costs, most likely hasn't changed that much. Thus, any change in the natural rate of unemployment is probably coming from changes in structural unemployment. Below are unemployment tables constructed from the different measures of the output gap discussed in this note. The first table shows the implied natural rate of unemployment and the second one shows the implied cyclical rate of unemployment (i.e. actual unemployment rate minus the natural rate of unemployment). Click on the figure to enlarge it:
What this table indicates is that since 2008:Q4 cyclical unemployment has been hovering around 3.0% while the natural rate has been growing steadily and now is around 6.8%. This data, if correct, suggests that folks like me who call on the Fed to do more in terms of stabilizing aggregate demand should realize the limits of macroeconomic policy. Still, providing a stable monetary and aggregate demand enironment in which the structural adjustments can take place should not be overlooked.