Cost-push inflation is a rise in the overall price level caused by higher production costs, like wages, raw materials, or energy. In Principles of Macroeconomics, it shows up as a leftward shift in aggregate supply.
Cost-push inflation is inflation that starts on the supply side, not because shoppers suddenly buy more, but because it gets more expensive to produce goods and services. When firms face higher wages, pricier oil, expensive imported inputs, or supply chain disruptions, they often raise prices to protect profits. The result is a higher overall price level, even if demand has not changed much.
In Principles of Macroeconomics, the clean way to show this is with the AD/AS model. A rise in production costs shifts short-run aggregate supply left. That means firms produce less at every price level, so real output falls while the price level rises. This is one reason cost-push inflation can feel especially painful: you get inflation and weaker growth at the same time.
A common example is an oil shock. If fuel becomes much more expensive, transportation and manufacturing costs rise across the economy. A trucking company pays more for gas, a bakery pays more to ship ingredients, and a retailer may pass those extra costs along to customers. Even businesses that do not use oil directly can be affected because higher transport costs raise their total expenses.
This is different from demand-pull inflation, where total spending rises faster than the economy can produce goods. With cost-push inflation, the problem is that production itself has become more expensive. You are not seeing too much spending chasing too few goods, you are seeing fewer goods being produced at the old cost structure.
Cost-push inflation also matters because it can create stagflation, which is the uncomfortable mix of rising prices, slow growth, and unemployment. If firms cut production because costs are too high, workers may be laid off even while prices keep climbing. That combination is one reason macroeconomists pay close attention to supply shocks, not just demand changes.
The idea also shows up in real-world inflation comparisons across countries and regions. Economies that rely heavily on imported energy, food, or industrial inputs can be more exposed to cost shocks. If the exchange rate weakens or global commodity prices jump, domestic firms may face higher costs and pass them into consumer prices.
Cost-push inflation is one of the fastest ways to explain why inflation can rise even during a weak economy. In macro, that matters because it changes how you read graphs, policies, and news headlines. If prices are rising because supply got more expensive, the usual fix is not the same as the fix for strong-demand inflation.
It also connects directly to the trade-off at the center of the Phillips Curve. A cost shock can push inflation up while unemployment rises, which breaks the simple inverse pattern people expect. That is why a period of cost-push inflation can make the economy look messy: the usual one-variable explanation does not work.
When you study the AD/AS model, cost-push inflation gives you a clear reason for leftward shifts in short-run aggregate supply. That lets you explain lower actual output, higher prices, and slower growth in the same diagram. It is a core tool for analyzing recessions caused by shocks, not just by weak spending.
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Visual cheatsheet
view galleryAggregate Supply
Cost-push inflation is usually shown through a leftward shift in aggregate supply. That shift means firms are supplying less output at every price level because production costs rose. If you can read the AS curve correctly, you can explain why inflation can happen at the same time as falling real GDP.
Demand-Pull Inflation
These two types of inflation are often confused, but they start in different places. Demand-pull inflation comes from too much spending, while cost-push inflation comes from higher production costs. A good macro answer usually identifies which side of the economy is driving the price increase before naming the inflation type.
Phillips Curve
Cost-push inflation can create a bad trade-off on the Phillips Curve. Prices rise even as unemployment increases, so the usual inverse relationship looks weaker or breaks down. That is why supply shocks are such a big deal in inflation discussions, especially when the economy is already struggling.
Expansionary Policy
Expansionary fiscal or monetary policy can raise demand, but it does not directly fix higher production costs. If inflation is caused by supply problems, pushing demand harder may add more inflation pressure. That makes policy choices trickier, because the economy may need support for output without making prices climb even faster.
A problem set or quiz question will usually give you a scenario, like oil prices rising, wages increasing, or shipping costs jumping, and ask you to identify the inflation type. Your job is to connect the shock to the AD/AS graph: higher costs shift short-run aggregate supply left, which raises the price level and lowers real output. If the question mentions unemployment rising at the same time as inflation, that is a strong clue that cost-push inflation is involved.
In a short response or essay, you may also need to compare it with demand-pull inflation or explain why the Phillips Curve relationship looks weaker during a supply shock. The best answers name the cause, show the curve movement, and describe the result in plain macro terms.
Demand-pull inflation happens when aggregate demand rises faster than the economy's ability to produce. Cost-push inflation happens when production costs rise and firms pass those costs into prices. If the prompt emphasizes spending, consumer demand, or stimulus, think demand-pull. If it emphasizes wages, inputs, oil, or supply disruptions, think cost-push.
Cost-push inflation means the overall price level rises because it costs more to produce goods and services.
In the AD/AS model, it shows up as a leftward shift of short-run aggregate supply, which raises prices and lowers real output.
Supply shocks like oil spikes, wage increases, and supply chain problems are classic causes.
This kind of inflation can lead to stagflation, where inflation is high while growth and employment are weak.
If a scenario mentions higher costs plus lower output, cost-push inflation is usually the right label.
Cost-push inflation is inflation caused by higher production costs, not by stronger consumer demand. In macro terms, firms pass those higher costs into prices, so the general price level rises. It is usually modeled as a leftward shift in short-run aggregate supply.
It shifts short-run aggregate supply left because firms cannot produce as much at the old cost structure. That leads to a higher price level and lower real GDP. If you see prices rising while output falls, that is the AD/AS pattern to look for.
Common causes include higher wages, more expensive raw materials, energy price spikes, and supply chain disruptions. In open economies, a weaker exchange rate can also raise the cost of imported inputs. Any shock that raises firms' costs can trigger it.
Demand-pull inflation starts when spending grows faster than supply, so prices rise because buyers are bidding up limited goods. Cost-push inflation starts when supply gets more expensive, so firms raise prices even without extra demand. The cause is the main difference.