Open-economy inflation
Open-economy inflation recognises that prices in a trading economy are shaped not just by domestic demand and monetary policy, but by import prices, exchange rates, global commodity markets, and international interest rate differentials. Small, trade-dependent economies can import inflation — or disinflation — from abroad regardless of domestic policy.
How open economies import inflation
In a completely closed economy, inflation is determined entirely by domestic money supply, demand, and supply conditions. In reality, every significant economy trades goods, services, and capital internationally — and this openness means inflation is partly determined outside its borders. The three main channels through which global forces affect domestic inflation are:
Import prices: When a country imports goods (oil, food, electronics, clothing), changes in world prices or the exchange rate directly affect domestic prices. A 20% rise in oil prices raises petrol costs in any oil-importing country regardless of domestic monetary policy. This is the core of imported inflation.
Exchange rate pass-through: If the domestic currency depreciates, imports become more expensive in local currency terms — even if world prices haven't changed. The extent to which exchange rate changes pass through to consumer prices is measured by the exchange rate pass-through coefficient. High pass-through (common in small, open economies like Armenia, New Zealand, or Hungary) means exchange rate moves are a major inflation driver.
Global monetary policy spillovers: When the US Federal Reserve raises rates, the dollar strengthens. This raises commodity prices in other currencies and tightens financial conditions globally — affecting inflation in countries that did not change their own rates. The Fed's 2022–24 tightening cycle was estimated to have added 0.5–1.5 pp to inflation in some emerging markets through the dollar channel.
Policy challenges in open economies
Open-economy inflation creates specific challenges for inflation-targeting central banks. The primary difficulty is the "imported component": if inflation rises because oil prices rose globally, should the central bank raise rates in response? The case for doing so is that if second-round effects (higher wages, higher prices in other sectors) take hold, the original supply shock becomes entrenched. The case against is that raising rates in response to a supply shock that will self-reverse creates unnecessary unemployment with no lasting benefit — this is the "look-through" approach.
In practice, most central banks "look through" the first-round effects of commodity price shocks (energy and food in CPI) but respond if they see second-round effects emerging in core inflation or wage growth. The 2021–23 global inflation episode tested this framework: many central banks were slow to respond partly because the initial shock looked imported and temporary, but became embedded through wages and services prices — arguing for earlier action in retrospect.
Small open economies vs large closed economies
The importance of open-economy inflation varies dramatically with country size and trade openness. The US (trade share of GDP ~25%) is relatively insulated from external price shocks — its domestic demand and monetary policy are the dominant inflation drivers. By contrast, Belgium, Ireland, or Armenia (trade share >70% of GDP) have little control over a large fraction of their consumer price basket. Armenia's food and energy inflation in 2022 was almost entirely imported — the CBA could moderate second-round effects but could not prevent the initial pass-through. The terms of trade concept captures the aggregate effect of import vs export price changes on national purchasing power. Our inflation explorer shows how small open economies like Armenia, New Zealand, and Ireland can have more volatile inflation histories than large economies like the US or Germany.
Frequently asked questions
Can a small open economy really control its own inflation?
Yes, but with important constraints. A central bank with an independent monetary policy and a flexible exchange rate can offset external inflation shocks — by raising rates, it attracts capital inflows that appreciate the exchange rate, making imports cheaper. This is the basic mechanism of inflation targeting in small open economies. However, the offset is never perfect: the exchange rate channel works with lags (6–18 months), and extreme commodity price shocks can overwhelm a central bank's ability to absorb them through the exchange rate alone. Countries with fixed exchange rates (like eurozone members) have no exchange rate tool at all — they are fully exposed to imported inflation from outside the euro area.
How did open-economy factors affect the 2021–26 global inflation surge?
The 2021–26 episode was heavily influenced by open-economy channels. The initial surge was driven by: (1) global supply chain disruptions (containers, semiconductors) raising import prices everywhere; (2) the commodity price spike of 2022 (energy, grain, vegetable oil) following Russia's invasion of Ukraine — a pure external supply shock; (3) the dollar strengthening in 2022 as the Fed hiked first and most aggressively, which raised commodity prices in local currency terms for most non-dollar economies. Even countries with very tight domestic monetary policy — like Brazil — faced food inflation above 15% because of these external channels.
What data can I use to measure the imported component of inflation?
Three main data sources: (1) Import price indices — most national statistics offices publish monthly import price deflators, which show how much imported goods prices are changing. (2) Terms of trade indices (export prices / import prices) — available from national accounts data and the World Bank. (3) The FAO Food Price Index and World Bank commodity price data — for the commodity components. Researchers decompose CPI into "tradeable" (exposed to international prices) and "non-tradeable" (sheltered domestic services) components to isolate the open-economy contribution.