#1. Haunted by past bouts of inflation.
There is not a major central bank I can think of, including the Federal Reserve, which wasn’t permanently scarred by the unmooring of inflation expectations and resulting stagflation of the 1970s.
The term was first used in reference to the vicious cycle of escalating inflation, eroding living standards and persistently weak growth in the U.K. in the 1960s. Later, it was used to describe the U.S. after OPEC moved to embargo oil in 1973. The surge in oil prices triggered a synchronous rise in inflation and unemployment. Inflation and elevated levels of unemployment persisted, even after the recession ended in 1975.
The Fed is good at learning from past mistakes. Fed Chairman Jay Powell and his colleagues have underscored the point by arguing that unemployment is “unsustainably” low. They are willing to accept a recession today to derail a more persistent and corrosive bout of inflation going forward. (Those shifts in policy open the door to the Fed making a new set of mistakes.)
Central banks can’t calibrate recessions. The impact rate hikes have on the economy is nonlinear. No one, including researchers at the Fed, knows how reductions in the balance sheet will amplify short-term rate hikes. That means that the Fed can’t calibrate the magnitude of credit market tightening or the depth of the recession it might trigger. Financial markets are more integrated than in the early 1980s, the last time the Fed derailed inflation.