Supply chain uncertainty amplifies energy inflation, challenges policy
A new ECB working paper finds that energy price pass-through to inflation is significantly stronger when supply chain uncertainty is elevated. Firms interpret energy prices as signals of broader supply disruptions, challenging conventional monetary policy responses.
Energy prices as supply disruption signals
The study documents that the pass-through of energy prices to inflation is state-dependent, intensifying when logistical networks are stressed.
This pattern was evident during the 2021-2023 inflation surge and again with the Iran conflict in 2026, which triggered an oil price spike and renewed supply chain uncertainty.
Firms, facing bottlenecks and uncertain input availability, treat energy prices as noisy signals of broader supply disruptions.
This signal-extraction channel increases perceived marginal costs, creating an 'uncertainty wedge' that amplifies and propagates energy shocks.
Empirical evidence from U.S. and Euro area data supports this: consumer prices react much more strongly to oil shocks during periods of high supply chain uncertainty, and energy prices become more informative about logistical conditions than traditional transportation indicators.
Textual analysis of earnings calls further corroborates that managers link energy costs and supply bottlenecks more strongly when uncertainty is high.
The uncertainty wedge in inflation dynamics
The paper develops a microfounded New Keynesian model where firms form Bayesian beliefs about unobserved upstream supply chain conditions using energy prices.
In this model, firms combine energy and specialized inputs transported through a capacity-constrained network.
When congestion binds, specialized inputs face delivery delays, while energy remains available at a premium, reflecting transportation conditions.
This signal-extraction problem introduces an endogenous 'uncertainty wedge' into the New Keynesian Phillips Curve.
This component, absent under complete information, is activated by energy price shocks.
When supply chain uncertainty is elevated, firms place greater weight on energy prices as signals of persistent logistical disruptions, causing even purely transitory energy shocks to generate an inflation response that is both larger on impact and more persistent than in stable supply chain environments.
The volatility of transportation shocks, not just their level, thus becomes a key determinant of inflation dynamics.
Beyond 'look through' policy
The paper fundamentally challenges the conventional wisdom for central banks to 'look through' energy price shocks.
When supply chains are volatile, even temporary energy shocks can become entrenched, leading to persistent inflationary pressures.
This necessitates a state-contingent monetary policy, considering not just energy prices but also supply chain conditions.