The structural unemployment rate comes from the mismatch between supply and labor demand, an approach the equilibrium unemployment rate. It depends on the importance of the rigidities that hinder the smooth functioning of the labor market. There are two approaches to the equilibrium unemployment rate:
A positive vision of the New Keynesian economy, the unemployment rate to balance WS-PS. As the natural rate of unemployment, it also reflects the rigidities that prevent real wage adjustment. However, he admits the existence of involuntary unemployment, moreover, it does not have the best of full employment as in Friedman. There are two applications of this concept of structural unemployment:
The NAIRU, which comes mainly from an empirical approach (we seeks to achieve an econometric estimation of structural unemployment).
Unemployment equilibrium model WS-PS which comes mainly from a theoretical approach (seeking to highlight the underlying factors in structural unemployment), but can nevertheless be estimated empirically. The hysteresis effect of unemployment takes this second approach.
My question is very simple. I can not understand precisely how the NAIRU and operate the WS-PS. Someone enlighten me to happen to synthetically?