Central Banks and the Natural Rate of Unemployment

The Economist on the natural rate of unemployment:

https://www.economist.com/news/economics-brief/21727050-policymakers-have-spent-half-century-search-natural-rate-unemployment

New statistical approach introduced for estimating the US natural rate of unemployment by economists at the FEDERAL RESERVE BANK OF SAN FRANCISCO:

http://www.frbsf.org/economic-research/publications/economic-letter/2017/august/natural-rate-of-unemployment-over-past-100-years/el2017-23.pdf