Slowly, but steadily the Wicksellian concept of a natural, normal or neutral rate of interest is making a come back and becoming more relevant and cited than Friedman's natural rate of unemployment and its awkward twin the Non Accelerating Inflation Rate of Unemployment (NAIRU).
Note that up to Friedman's infamous presidential address the normal rate dominated the field. But in all fairness, even thought it has lost space it seems that Friedman's natural rate of unemployment has a lot of inertia, and might be with us for a while.
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