Phillips Curve and Persistently Low Inflation

Why Low Inflation Is No Surprise by J. BRADFORD DELONG
https://www.project-syndicate.org/commentary/low-inflation-no-surprise-by-j--bradford-delong-2018-01

Peter Coy on the relevance of the Phillips Curve

https://www.bloomberg.com/news/articles/2018-01-02/why-inflation-stays-low-even-though-unemployment-is-down

Related:

https://www.bloomberg.com/news/articles/2018-01-04/these-classic-charts-are-confounding-economists

My own perspective on the persistence of low inflation:

http://www.ut.edu/uploadedFiles/Academics/Business/TBE_Fall_2017.pdf