There are always "temporary" factors.
1973: OPEC embargo hit in October. By December CPI was up 8.9% y-o-y & FOMC that month voted to *ease* to offset oil shock.
In 12 months following, inflation would hit 12.1%, while real GDP would fall 1.9%. federalreserve.gov/monetarypolicy…
March 1979: y-o-y CPI inflation was 10.3%. FOMC: "A significant easing of rapid rise in prices was suggested... recent increases in prices represented temporary factors." Voted to keep policy unchanged.
In following 12 months inflation would hit 14.6% & real GDP would fall 0.8%.
I'm sure there are more...these were just the most obvious. Arguably this more recent one went the other way, arguing that inflation undershoot was due to temporary factors: nytimes.com/2017/06/14/ups…
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Me today @NRO, "The unprecedented surge in unemployment benefits and other government-transfer programs during COVID-19 is showing increasing signs of long-term economic impacts." nationalreview.com/2021/10/when-u…
The changes in the labor market over the course of the pandemic raise the specter of “hysteresis,” where short-term economic shocks have long-term impacts, even after the shock subsides. This concept became widespread during the European unemployment dilemma of the 1980s.
As discussed in Ljungqvist & Sargent (1998), the enhanced social-insurance programs in Europe turned temporary shocks into persistent increases in unemployment. Average unemployment rates in France doubled from the 1970s to the 1980s, with 2/3 unemployed for 6 months or more.