Demand-pull and cost-push inflation: how to tell overheating from a cost shock

The difference lies in the source of the pressure on prices. Demand-pull inflation arises when effective demand outruns the economy's capacity to produce: the money is there, but there are not enough goods and workers to match it, and the seller raises the price because the buyer is willing to pay. Cost-push inflation comes from the other side of the counter: raw materials, imported components, logistics, labour or regulated tariffs become more expensive, and the producer passes the higher cost on into the price even if demand is not growing but weakening. The practical point of the distinction is that the key rate hits demand and is almost powerless against a cost shock. That is why the diagnosis determines the central bank's response, the behaviour of long-dated bonds, and which companies will keep their margins.

Demand-pull inflation: the economy is running above its capacity

Here the mechanism starts with incomes and credit. Expanding budget spending, fast wage growth, easily available lending, accumulated savings that come onto the market all at once — all of this increases the amount of money chasing the same set of goods. As long as the economy has idle capacity and spare hands, additional demand turns into output. When the reserves run out, it turns into prices.

Demand-pull inflation can be recognised by its breadth: it is not a particular category that gets more expensive but almost everything at the same time, including services that depend neither on the harvest nor on the exchange rate. Signs of an overheated labour market appear alongside it — vacancies go unfilled, and wages rise faster than productivity. This is exactly the kind of inflation that monetary policy works against directly: expensive credit cools demand, saving becomes more attractive than consumption, and the pressure on prices eases. For this type, core inflation is the useful gauge — it strips out the most volatile items and shows the persistent part of price growth.

Cost-push inflation: production gets dearer, not the desire to buy

The opposite case is a supply-side shock. A poor harvest, a weaker national currency, rising fuel prices, more expensive freight, broken supply chains, the indexation of regulated tariffs, higher indirect taxes. Costs rise along the entire chain, and every participant in it tries to pass the increase further down. The end buyer sees prices rising while their income has not grown — hence the characteristic feeling that inflation "eats up" more than the index shows.

The key feature of such inflation is that it is narrow and uneven. A specific segment becomes much more expensive: food, fuel, imported appliances and electronics, housing and utility services. A considerable part of this increase is by its nature non-monetary: its cause lies outside the circulation of money, and a rate hike removes it only indirectly, through the exchange rate and through slower demand — that is, at the price of a slowing economy. In its extreme form this looks like stagflation: prices go up, output goes down.

Where the distinction breaks down

An honest caveat: neither type is ever really found in its pure form, and the source of the pressure cannot be read from the aggregate consumer price index at all. What is needed is the structure — the breakdown by groups of goods and services, the path of producer prices, wage data, estimates of the persistent and volatile components. How the index itself is built and why a personal basket diverges from the official one is covered in detail in the article "Inflation: how it is calculated".

What is more, the types turn into each other. A cost shock lifts prices, workers demand that wages be indexed, the higher wages turn into demand — and from then on inflation lives on its own momentum. This transition is what is called an inflationary spiral; its fuel is expectations. As soon as households and businesses start building future price growth into contracts and price tags, the discussion about the original source loses its meaning: the central bank has to squeeze demand regardless of how it all began.

How an investor should read this

What matters to the market is not the label but the regulator's expected response. If demand-pull inflation prevails, the market expects tight policy: short rates rise, the OFZ yield curve flattens or inverts, and long fixed-coupon issues fall in price. The spread between the yields of conventional and inflation-linked securities gives breakeven inflation — the market's estimate of future price growth, which is worth comparing with official forecasts.

If a cost shock prevails, the signal is different: the rate may not rise straight away, but corporate profits will come under pressure. Here it is useful to look at the structure of the financial statements — how profitability behaves, and whether the company manages to pass costs through into its selling prices. Different sectors of the equity market go through such a shock differently: companies with pricing power and their own raw materials are better protected than processors with a long procurement chain. This is worth checking against the published reports, and the dates of rate decisions and statistical releases against the events calendar.

The basic definitions, including inflation and hyperinflation, are collected in the glossary.