Cost-push inflation is inflation caused by higher input costs, like wages, oil, or raw materials, which pushes firms to raise prices. In Intermediate Macroeconomic Theory, it is usually explained with supply shocks and the AD-AS model.
Cost-push inflation is a rise in the general price level that starts on the supply side of the economy. Instead of prices rising because households and firms are spending more, prices rise because it has become more expensive to produce goods and services. In Intermediate Macroeconomic Theory, you usually see this as an upward pressure on firms’ costs that shifts short-run aggregate supply left, which reduces output and raises the price level at the same time.
A simple way to think about it is this: if a bakery suddenly pays more for flour, energy, and labor, it may raise the price of bread to protect profit margins. If that happens across many industries, the whole economy can see higher inflation. The original shock can come from oil price spikes, imported input shortages, wage increases, shipping bottlenecks, crop failures, or other supply disruptions.
This is why cost-push inflation is closely tied to supply shock. The shock does not have to hit every market equally, but if it affects major inputs, it can feed into many final prices. A rise in oil prices, for example, can raise transportation costs, manufacturing costs, and utility costs, which then show up in consumer prices across a broad set of goods.
The AD-AS framework makes the mechanism easier to see. When costs rise, the short-run aggregate supply curve shifts left, so the economy produces less output at a higher overall price level. That combination is what makes cost-push inflation harder to deal with than simple demand-driven inflation, because the economy is not just “too hot.” It may also be producing less and facing weaker employment.
That is why cost-push inflation can lead to stagflation, the uncomfortable mix of higher inflation, slower growth, and higher unemployment. A policy response is tricky here: if policymakers tighten demand to fight inflation, output can fall even more. If they try to support output too aggressively, inflation may stay elevated if the supply problem has not eased.
Cost-push inflation matters because it shows why inflation is not always a sign of excessive spending. In Intermediate Macroeconomic Theory, the cause of inflation changes the policy question. If prices are rising because of supply shocks, the problem is not just too much demand. It may be a real economy issue, like a jump in energy prices or a disruption in production networks.
This term also connects inflation to unemployment and output. A demand-driven price increase can sometimes come with stronger production, but cost-push inflation often comes with weaker output. That is the setup behind stagflation, which is one of the cleanest examples of why macro policy is hard. You are not choosing between “low inflation” and “high growth” in a simple way, because the economy may already be losing both.
It also helps you interpret graphs, news stories, and policy debates. When a question says inflation rose after an oil shock, a wage spike, or a shipping bottleneck, you should think about higher costs moving through the economy, not just rising consumer demand. That is the move professors usually want when they ask you to identify the source of inflation in a model or a case.
Keep studying Intermediate Macroeconomic Theory Unit 6
Visual cheatsheet
view gallerySupply Shock
A supply shock is one of the main triggers of cost-push inflation. When the shock raises the cost of producing goods or interrupts production, firms face tighter margins and often pass those costs along. In an AD-AS graph, this is the event that helps explain why the short-run aggregate supply curve shifts left.
Demand-Pull Inflation
Demand-pull inflation comes from excess spending, not higher production costs. The two can look similar on a price chart, but the story behind them is different. If your professor gives you a scenario about stronger consumer demand, that points away from cost-push inflation and toward demand-pull inflation.
Inflation Rate
Cost-push inflation is one reason the inflation rate rises over time. The inflation rate is the measurement, while cost-push inflation is one cause behind the measurement. When you interpret data, the same inflation rate can come from different sources, so the cause matters as much as the number itself.
Core Inflation
Core inflation strips out volatile food and energy prices, which often jump because of supply shocks. That makes it useful when you want to see whether price increases are broad-based or being driven by temporary cost pressures. It does not erase cost-push inflation, but it can help separate short-lived shocks from more persistent inflation.
A problem set question may give you a scenario, like an oil price spike or a factory shutdown, and ask you to identify the type of inflation and show the effect on AD-AS. Your job is to trace the shock from higher input costs to a leftward shift in short-run aggregate supply, then explain why prices rise while output falls. In short answer or essay questions, you may also be asked to compare this with demand-pull inflation or explain why stagflation can happen. If you see a graph, look for the combination of higher price level and lower real output rather than a simple rise in demand.
These are often confused because both raise the price level, but the cause is different. Cost-push inflation starts with higher production costs or supply disruptions, while demand-pull inflation starts with too much spending chasing too few goods. In macro graphs, cost-push inflation usually means lower output, while demand-pull inflation usually means higher output in the short run.
Cost-push inflation is inflation caused by higher production costs, not by stronger demand.
A supply shock, like an oil price spike or a shortage of inputs, is a common trigger.
In the AD-AS model, cost-push inflation usually shows up as a leftward shift of short-run aggregate supply.
This type of inflation can reduce output and raise unemployment at the same time, which is why stagflation can happen.
When you analyze a scenario, focus on the source of the price increase before you name the type of inflation.
It is inflation caused by rising production costs, such as higher wages, energy prices, or raw material prices. In Intermediate Macro, it is usually explained with a supply shock that shifts short-run aggregate supply left and raises the price level.
Cost-push inflation starts with higher costs for firms, while demand-pull inflation starts with too much spending in the economy. The distinction matters because the same increase in prices can come from different macro forces, and the policy response is not the same for both.
Common causes include oil price increases, wage growth that outpaces productivity, shortages of key inputs, tariffs, and supply chain disruptions. These shocks make production more expensive, so firms often raise prices to maintain profit margins.
Because the economy can end up with both higher prices and lower output at the same time. The supply-side shock pushes prices up, but it also makes it harder to produce the same amount of goods and services, which can slow growth and raise unemployment.