Hormuz shipping shocks curb global output and lift inflation
Maritime traffic disruptions in the Strait of Hormuz act as a direct supply shock that raises consumer prices and depresses global output, according to a Bank for International Settlements working paper.
Stagflation through the strait
Disruptions to vessel traffic in the Strait of Hormuz trigger a persistent stagflationary pattern across the global economy.
Tracking observed ship movements via the Portwatch database from the International Monetary Fund and University of Oxford reveals immediate supply stress.
When chokepoint transit drops due to supply constraints, energy and fertiliser prices rise, with larger increases following supply-driven drops in traffic.
These commodity price shocks feed into weaker global industrial production and elevated consumer prices.
The adverse macroeconomic effects emerge after four to six months and persist for up to one year across advanced economies and emerging markets.
Tanker traffic sets credit spreads
Chokepoint disruptions quickly spill into financial markets by tightening global credit conditions.
Corporate bond yield spreads widen, with high-yield issuers experiencing the largest increases, while sovereign spreads across emerging market economies expand in tandem.
The risks are skewed to the upside: higher starting inflation or baseline spreads amplify the subsequent price and credit increases.
While chokepoints such as the Strait of Malacca and Gibraltar also matter, Hormuz stands out as the primary barometer of supply conditions.
A hard reality check for central banks
Real-time vessel tracking exposes how quickly regional geopolitical bottlenecks can trigger global supply-side inflation.
By demonstrating that credit spreads widen simultaneously, the analysis shows why monetary policy faces stark trade-offs during maritime shocks.
Central banks must treat chokepoint flows as a direct macro indicator.