Bank of England Study Reveals Inflation Index Mismatch in Monetary Stabilization

The Bank of England has released a research paper that examines the mismatch between inflation indices used for monetary stabilization and those that track household living costs. According to the study, policymakers may need to respond to a different mix of prices than currently used.

The research found that expenditure weights in consumer inflation do not necessarily match the sectoral weights that best support welfare under interest-rate policy. Euro-area data showed a clear divergence between discretionary and necessity sectors.

The study suggests that a stabilization index should heavily weight discretionary-sector prices rather than aggregate CPI inflation in policy rules. Model simulations indicate that a discretionary inflation rule can reduce sectoral inflation volatility and close nearly two-thirds of the welfare gap with first-best Ramsey policy.