Faced with a stagflationary shock, the Federal Reserve is on hold. Its next move will be dictated by inflation *expectations*, measured by the 5-year breakeven rate. If expectations remain anchored, the Fed can focus on growth; if they rise, aggressive rate hikes will follow.

The Federal Reserve's practice of pre-committing to low interest rates (forward guidance) hindered its ability to react swiftly to rising inflation in 2021. This policy trap caused the Fed to be late in raising rates, allowing the economy to overheat and inflation to take hold, a mistake the new leadership seeks to avoid.

The Fed's concern isn't just the current high inflation rate, but the risk that prolonged high inflation changes public psychology. If businesses and consumers begin to expect continued price hikes, they may become less price-sensitive, creating a self-reinforcing 'snowball' effect that makes inflation much harder to control.

A more aggressive Federal Reserve reaction function is interpreted as a tightening signal by inflation markets. This leads to lower inflation break-evens and higher real yields, a counter-intuitive move compared to when the Fed and markets react in tandem to strong economic data.

Despite recent inflation nearing double digits, market expectations for inflation five years out remained stable at the Fed's 2% target. Austan Goolsbee argues this was only possible due to the Fed's credibility, which prevented a dangerous spiral where people's actions make high inflation a self-fulfilling prophecy.

Contrary to the popular memory of him letting the 90s boom run hot, Alan Greenspan's Fed aggressively hiked rates to 6.5% by 2000. This was a preemptive move to curb inflation and irrational exuberance, even amid strong productivity growth.

Goolsbee pushes back against the idea that high wage growth prevents inflation from falling. He argues the dynamic is the reverse: prices are less sticky and rise first in response to a shock, followed by wages. This means seeing high wage growth while inflation falls is a normal part of the disinflationary process.

The textbook response to supply-shock inflation is to "look through" it and hold rates. However, one expert argues that after five years of high inflation, the sheer duration creates a risk of it becoming embedded. This "duration risk" could override the cause, forcing the Fed to tighten policy as a risk management measure.

The Federal Reserve can tolerate inflation running above its 2% target as long as long-term inflation expectations remain anchored. This is the critical variable that gives them policy flexibility. The market's belief in the Fed's long-term credibility is what matters most.