One change in the NARU long-term assumption is to accept that it changes over time, albeit slowly and indeed much more sluggish than what is normally used in estimates of NAIRU that even show yearly changes.
About these time-varying NARUs and NAIRUs, Farmer refuses the whole concept[44] : “Defenders of the Natural Rate Hypothesis might choose to respond to  8  BIS central bankers’ speeches  these empirical findings by arguing that the natural rate of unemployment is time varying.