Monetary policy operates with a 12-18 month lag, whereas the inflationary effects of oil shocks are immediate and front-loaded. By the time interest rate changes impact the economy, the initial inflationary pressure from oil has passed, making a policy response ineffective and potentially harmful.

Central banks like the ECB have a single mandate for price stability, forcing them to hike rates in response to oil-driven inflation. The US Fed, with a dual mandate including employment, has historical precedent for "looking through" these temporary shocks, creating significant policy divergence between major economies.

Historical precedent is unequivocal: central banks do not cut interest rates in response to an oil shock. Despite the negative growth impact, their primary concern is preventing the initial price spike from embedding into long-term inflation expectations. Market hopes for easing are contrary to all historical data.

Central bankers are caught in a tug-of-war. The slow reaction to the 2022 energy shock taught them to act decisively against inflation by raising rates. However, intense political pressure may push them to keep rates low, creating a difficult choice between applying learned economic prudence and ensuring political survival.

Inflation from a supply disruption, like an oil price spike, will eventually fade. It only becomes persistent and embedded in the economy if governments try to 'help' consumers pay for higher costs with stimulus checks, which increases the broad money supply.

The Federal Reserve focuses on growth risks from an oil shock as the US services-based economy sees less impact on core inflation. In contrast, the European Central Bank is more likely to raise rates, prioritizing inflation control due to faster price pass-through in the euro area.

While initial energy price spikes boost short-term inflation expectations, a sustained shock eventually hurts economic growth. This growth concern acts as a natural ceiling on long-term inflation expectations (break-evens), as markets anticipate an economic slowdown, preventing them from rising indefinitely.

The key variable in the current oil crisis is its duration. Because the supply shock is expected to last for quarters, not just months, the long-term drag on economic activity becomes a greater concern for markets than the initial spike in inflation, changing the calculus for policymakers.

An oil supply shock initially appears hawkishly inflationary, prompting central banks to hold or raise rates. However, once prices cross a critical threshold (e.g., >$100/barrel), it triggers severe demand destruction and recession, forcing a rapid policy reversal towards aggressive rate cuts.