The new Fed chairman prefers a "trimmed mean" inflation gauge which currently reads lower than traditional measures. By excluding items like energy, this change provides political cover to cut interest rates before an election, even if underlying inflation remains high, effectively moving the goalposts to suit a policy objective.

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.

Recent bond market volatility stems from a Fed credibility issue, not just rate expectations. Uncertainty over which inflation metric the Fed is targeting (e.g., Core PCE vs. Dallas Trimmed Mean) creates ambiguity about its reaction function, fueling investor fear and raising the term premium.

Ongoing political pressure, including attempts to remove a governor and uncertainty over the next Fed Chair, is perceived as a threat to the Federal Reserve's independence. This political risk is a key factor leading to the view that inflation break-evens are too low and their risks are skewed to the upside.

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.

While the direct impact of tariffs may be temporary, the elongated process risks making consumers and businesses comfortable with higher inflation. Combined with questions about the Federal Reserve's political independence, this could unmoor expectations and make inflation persistent.

Central bank credibility is a finite resource. By not fully stamping out inflation to its 2% target, the Fed depletes its credibility, making the next inflationary shock harder and more costly to control—a lesson from the recurring inflation of the 1980s.

Even as recent inflation surged, market expectations for inflation five years out remained stable at the Fed's 2% target. This demonstrates the power of the Fed's credibility. If the market loses faith, it can trigger a self-fulfilling wage-price spiral, making it much more painful for the central bank to rein in inflation.

The Fed faces a political trap where the actions required to push inflation from ~2.9% to its 2% target would likely tank the stock market. The resulting wealth destruction is politically unacceptable to both the administration and the Fed itself, favoring tolerance for slightly higher inflation.