Short-run Phillips Curve
Short-run Phillips Curve - Related Videos
01:28
The Emergence of the Phillips Curve
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2026
Economists have long explored how unemployment and inflation are related. In the 1950s, the economist A. W. Phillips analyzed almost a century of data from the United Kingdom to study this connection. His research examined the relationship between unemployment and changes in nominal wages. Phillips discovered that unemployment was usually low when nominal wages increased rapidly and high when nominal wages rose slowly.When employment opportunities are abundant and workers are few, firms compete...
01:24
Breakdown of the Phillips Curve (1970s)
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2026
During the 1960s, a stable trade-off between the inflation rate and the unemployment rate was observed, as represented by the Phillips curve. According to this relationship, low unemployment was generally associated with high inflation, while high unemployment was associated with low inflation. However, during the 1970s, this relationship broke down.A sharp rise in oil prices in 1973 led to higher production costs across various industries. At the same time, unemployment also increased,...
01:30
Short Run Aggregate Supply Curve
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2026
The short-run aggregate supply curve shows how much businesses are willing to produce when the overall price level changes, assuming their costs stay the same for a while. In this short period, wages and some input prices do not move right away. This delay gives firms a chance to earn more when prices rise.If prices go up and costs like wages stay fixed, businesses earn higher profits for the same amount of work. This encourages them to increase production. Because of this, the curve slopes...
01:25
Shifts of the Short Run Aggregate Supply Curve
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2026
The short-run aggregate supply curve helps us understand how much businesses are willing to produce at different price levels, assuming that certain costs, such as wages or raw materials, don't change immediately. This curve isn't fixed—it can shift based on what’s happening in the economy.When the curve shifts to the right, it means firms are able to produce more at every price level. This might happen when production becomes more efficient or less expensive. For instance, if a country...
01:23
Short-run Supply Curve in Perfect Competition
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2024
Consider a small enterprise engaged in producing and selling lemonade, operating in a market among numerous other firms with similar ventures. This enterprise, aiming to maximize profits without incurring losses, assesses its production costs to determine the optimal quantity of lemonade to produce. A crucial principle for this enterprise involves examining two critical cost aspects: the cost of producing an additional unit of lemonade, known as the marginal cost (MC), and the lowest cost at...
FAQs
A change in aggregate demand produces movement along the existing curve when inflation expectations remain unchanged. Stronger demand encourages firms to expand production and hire additional workers, lowering unemployment. At the same time, increased demand for labor and goods can raise wages and prices. The result is a temporary adjustment between the two variables rather than a shift of the curve.
Expected inflation determines whether the observed inflation-unemployment relationship remains stable. When expectations change, the curve can shift, so the same unemployment rate may be associated with a different inflation outcome. This mechanism explains why a policy that initially appears to improve employment may produce a weaker tradeoff later if people and firms revise their inflation expectations.
The tradeoff is limited because it depends on inflation expectations remaining unchanged. As expectations adjust, the relationship between inflation and unemployment can change, reducing the usefulness of the initial tradeoff. Consequently, policymakers should treat a short-run movement as conditional on the prevailing expectations rather than as a permanent way to maintain lower unemployment through higher inflation.
A movement along the curve follows a change in aggregate demand while inflation expectations stay fixed. A shift occurs when expected inflation changes, altering the relationship itself. This distinction helps analysts interpret policy outcomes correctly: an observed change in inflation and unemployment may reflect a demand-driven movement, or it may signal that expectations have changed and the curve no longer occupies its earlier position.
Policymakers use the curve to evaluate possible consequences of decisions affecting aggregate demand. Expansionary monetary or fiscal policy may support production and employment, but stronger demand can also intensify wage and price increases. The curve therefore provides a framework for weighing employment gains against inflationary pressure when considering competing policy objectives.
The framework helps policymakers ask whether a proposed demand change is likely to lower unemployment, increase inflation, or do both in the near term. It also prompts them to consider whether inflation expectations will remain stable. That second question is essential because a favorable initial tradeoff may weaken or disappear when expectations adjust, changing the policy outcome over time.