A spike in oil prices could keep CPI inflation above 3%. In this environment, the Fed cannot cut rates to support a weakening economy, as doing so would spook bond traders, risk higher long-term rates, and make financial conditions even tighter, effectively taking them 'off the table.'

The Federal Reserve is forced into a hawkish, inflation-fighting stance because the labor market and stock market are strong while inflation remains above target. This situation removes any justification for easing policy, making inflation the sole focus.

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 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.

Even if US inflation remains stubbornly high, the US dollar's potential to appreciate is capped by the Federal Reserve's asymmetric reaction function. The Fed is operating under a risk management framework where it is more inclined to ease on economic weakness than to react hawkishly to firm inflation, limiting terminal rate repricing.

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.

History suggests that if inflation remains high for too long, it can alter public psychology. Businesses may become less hesitant to raise prices, and consumers may grow more accepting of them. This shift can create a self-perpetuating feedback loop, or 'snowball' effect, making inflation much harder for the central bank to control.

War-induced oil shocks will create elevated inflation prints that persist for months, even if the conflict resolves today. This data lag handcuffs the Federal Reserve, preventing preemptive rate cuts and creating a minimum six-month pause on supportive action, which puts a ceiling on risk asset valuations.