The Iran war has demanded a new framework for thinking about UK monetary policy, as the Bank of England voted unanimously to hold rates at 3.75% on Thursday and acknowledged that the conflict had created economic conditions that do not fit neatly into conventional models. The monetary policy committee warned that the war’s energy price impact could push inflation above 3% and require rate hikes, while domestic indicators simultaneously point toward monetary easing. Officials described this combination as a significant challenge requiring careful and nuanced analysis.
The conventional monetary policy framework struggles with supply-side inflation shocks because the relationship between interest rates and prices is indirect and costly when the price rise originates in an external disruption rather than excess domestic demand. Raising rates when inflation is supply-driven reduces demand but does not increase supply, meaning the cure partially addresses the symptom while potentially worsening other economic conditions. The Bank’s framework needs to account for the nature of the shock, not just the scale of the inflationary outcome.
Governor Andrew Bailey implicitly acknowledged the need for nuanced thinking in his communications. He focused on the importance of assessing whether the shock would prove temporary or persistent, suggesting that the appropriate policy response depended on the duration and severity of the energy price disruption rather than the immediate inflation reading. His approach was more conditional and analytical than the simple rule of raising rates when inflation exceeds target.
Financial markets, operating with a simpler framework, moved to price in rate hikes in June and later in the year. UK gilt yields rose, the FTSE 100 fell, and the pound strengthened against the dollar as traders applied conventional models to the situation. The gap between the Bank’s nuanced thinking and the market’s simpler framework is itself a source of uncertainty.
For students of monetary policy, the Iran war episode provides a fascinating and important case study in the limits of conventional frameworks and the need for adaptive central bank thinking. The Bank of England’s ability to develop and communicate a framework appropriate to the specific nature of the current shock will be a test of its institutional sophistication and credibility. The months ahead will reveal how well it rises to that challenge.