Commodity inflation
When the price of oil or wheat rises, everything else eventually follows.
In plain words
Commodity inflation refers to price rises in the raw materials that underpin almost all economic activity: crude oil, natural gas, wheat, corn, soybeans, copper, aluminium. When these prices spike — because of supply disruptions, geopolitical events, or demand surges — the cost increases cascade through supply chains. A higher oil price raises the cost of fuel, which raises transport costs, which raises the shelf price of almost everything. The World Bank Commodity Markets Outlook tracks these dynamics quarterly.
How commodity inflation transmits to CPI
Transmission happens in waves. The first wave — within 1–3 months — is direct: higher petrol prices at the pump, higher food prices on shelves. The second wave — over 3–12 months — is indirect: higher energy and transport costs raise production costs for manufacturers, which eventually show up as higher prices for goods. The third wave — the most worrying for central banks — is when workers demand higher wages to compensate for cost-of-living increases, and firms raise prices to cover wage costs: a wage-price spiral. The IMF WEO analysed the 2021–2022 commodity shock in detail across the 2022 and 2023 issues.
Why it matters: the 2022 episode
The 2022 inflation surge was triggered in large part by commodity inflation. Russia's invasion of Ukraine caused European natural gas prices to spike 10×, disrupting fertiliser production and pushing food prices to records. The FAO Food Price Index hit an all-time high in March 2022. Brent crude exceeded $120/barrel. These commodity shocks hit every country — but those that import more energy and food (UK, Japan, most of Europe) suffered the largest terms-of-trade deterioration and highest CPI spikes. By 2024, most commodity prices had retreated, providing the "base effects" that mechanically lowered year-on-year CPI comparisons in 2024–2025.
Common misreadings
Commodity prices and consumer prices do not move in lockstep. Commodity inflation feeds into CPI with significant lags and partial pass-through. When oil prices fall 30%, petrol prices at the pump fall less (retailers maintain margins) and food prices barely fall at all in the short run (supply chains are sticky downward). This asymmetry — faster pass-through of commodity rises than falls — is documented by the BIS. Also, "food inflation" in CPI measures retail prices, not farm commodity prices — the margin between wheat prices and bread prices is large, so a 50% spike in wheat does not mean 50% more expensive bread.
Frequently asked questions
Why do central banks strip out food and energy from their inflation targets?
Central banks typically focus on "core" inflation — which excludes food and energy — because commodity prices are volatile and driven by global factors (weather, geopolitics, OPEC decisions) that monetary policy cannot address. Raising interest rates won't fix a drought or a pipeline disruption. If central banks reacted to every commodity spike, they would cause unnecessary economic volatility. That said, if commodity inflation persists long enough to change wage expectations, central banks must respond. The distinction between temporary supply shocks and persistent inflation is central to monetary policy decisions.
How do commodity prices affect CPI?
Commodity prices feed into CPI through two main channels. Directly: energy and food have explicit weights in the CPI basket (energy ~7%, food ~14% in US CPI). Indirectly: higher energy costs raise production and transport costs for almost all goods, pushing up their prices over 3–12 months. This second-round pass-through is slower and harder to measure. The IMF estimates that a 10% increase in global oil prices eventually raises CPI by 0.4–0.5 percentage points in advanced economies and up to 1 percentage point in commodity-importing emerging markets.
Where can I track global commodity prices?
The World Bank publishes the "Pink Sheet" — a monthly commodity price dataset covering energy, metals, agriculture, and fertilisers — free to download. The IMF's Primary Commodity Price System (PCPS) provides daily and monthly data for 74 commodities. For energy specifically, the US EIA and IEA publish weekly and monthly reports. FRED also carries key series: Brent crude (DCOILBRENTEU), WTI (DCOILWTICO), and the World Bank commodity indices.