Is Inflation Driven by Aggregate or Sectoral Output Gaps?

We examine whether inflation is driven by aggregate or sectoral output gaps. The aggregate output gap may not fully capture inflationary pressures because it can obscure sectoral shocks and heterogeneity in propagation to prices. We find that aggregating sectoral output gaps by weights estimated from real-time regressions produces a better fit of the Phillips curve than using the aggregate output gap. We confirm the sectorally-aggregated output gap based on these weights has significant explanatory power for inflation beyond the aggregate output gap and find it performs better in forecasting inflation, although the aggregate output gap retains its own distinct information.