Economics & Business · Year 11 · Macroeconomic Objectives · Term 3

The Phillips Curve: Inflation and Unemployment

Exploring the short-run trade-off between inflation and unemployment.

About This Topic

The Phillips Curve illustrates the short-run inverse relationship between inflation and unemployment rates. Year 11 students graph historical Australian data, such as from the RBA or ABS, to observe how falling unemployment often coincides with rising inflation. This trade-off stems from sticky wages and prices, where increased aggregate demand boosts jobs but pressures prices upward. Students connect this to ACARA's focus on macroeconomic objectives by analyzing how policymakers face choices between low inflation and low unemployment.

In the long run, the Phillips Curve is vertical at the natural rate of unemployment, as expectations adjust and inflation accelerates without reducing unemployment further. This critique, highlighted by 1970s stagflation, challenges the naive trade-off and emphasizes rational expectations. Students evaluate policy implications, like whether the RBA should prioritize inflation targeting over employment.

Active learning suits this topic because simulations and debates make the abstract trade-off tangible. When students role-play as policymakers or plot real-time data, they grasp policy dilemmas and long-run limits through collaboration and evidence-based arguments.

Key Questions

1. Explain the short-run relationship depicted by the Phillips Curve.
2. Analyze the policy implications of the Phillips Curve trade-off.
3. Critique the long-run validity of the Phillips Curve.

Learning Objectives

• Explain the short-run inverse relationship between inflation and unemployment as depicted by the Phillips Curve.
• Analyze the policy implications for the Reserve Bank of Australia when considering the short-run Phillips Curve trade-off.
• Critique the long-run validity of the Phillips Curve by referencing historical economic events like stagflation.
• Compare the short-run and long-run interpretations of the Phillips Curve, identifying the role of expectations.

Before You Start

Aggregate Demand and Aggregate Supply

Why: Understanding the interaction of AD and AS is fundamental to grasping how changes in demand can affect both price levels (inflation) and output (employment).

Introduction to Macroeconomic Indicators

Why: Students need prior knowledge of inflation and unemployment rates as key measures of economic performance to analyze their relationship.

Key Vocabulary

Phillips Curve	A model showing a short-run inverse relationship between the rate of unemployment and the rate of inflation in an economy.
Natural Rate of Unemployment	The unemployment rate that exists when the economy is at its potential output, also known as the non-accelerating inflation rate of unemployment (NAIRU).
Stagflation	A period characterized by high inflation, high unemployment, and stagnant demand, which contradicts the typical Phillips Curve relationship.
Aggregate Demand	The total demand for goods and services in an economy at a given overall price level and a given time period.

Watch Out for These Misconceptions

Common Misconception

The Phillips Curve trade-off holds permanently in the long run.

What to Teach Instead

The long-run Phillips Curve is vertical at the natural unemployment rate, as adaptive expectations lead to accelerating inflation. Role-playing simulations help students see how repeated demand boosts raise inflation without lasting job gains, correcting this through experiential evidence.

Common Misconception

Unemployment can be eliminated without inflation consequences.

What to Teach Instead

Pushing below natural unemployment triggers inflation via the short-run curve, but long-run adjustments negate gains. Debates on policy trade-offs reveal this limit, as students defend positions with data and peer challenge misconceptions.

Common Misconception

The curve applies equally to supply shocks.

What to Teach Instead

Supply shocks like oil crises shift the curve outward, causing stagflation. Analyzing historical charts in groups helps students distinguish demand-driven from supply-driven movements, building nuanced understanding.

Active Learning Ideas

Data Plotting: Australian Phillips Curve

Provide ABS data on inflation and unemployment from 1990-2023. In small groups, students plot scatter graphs, draw the short-run curve, and identify trade-offs. Discuss shifts using recent events like COVID recovery.

45 min·Small Groups

Policy Debate: Inflation vs Unemployment

Divide class into teams: one prioritizes low inflation, the other low unemployment. Teams prepare arguments using Phillips Curve evidence, then debate with RBA chair moderating. Vote on best policy.

50 min·Whole Class

Simulation Game: Expectations Adjustment

Pairs simulate short-run then long-run scenarios with cards representing demand shocks and wage expectations. Track inflation/unemployment paths on shared graphs. Reflect on vertical long-run curve.

35 min·Pairs

Critique Stations: Stagflation Cases

Set up stations with 1970s Australia, 2008 GFC, and 2022 data. Small groups analyze why Phillips Curve failed, noting expectations. Rotate and consolidate findings.

40 min·Small Groups

Real-World Connections

• The Reserve Bank of Australia (RBA) regularly analyzes inflation and unemployment data to inform monetary policy decisions, such as setting the cash rate, aiming to balance price stability with full employment.
• Economists at Treasury departments in Australian state governments use Phillips Curve concepts to forecast the impact of fiscal stimulus packages on employment levels and potential inflationary pressures.

Assessment Ideas

Discussion Prompt

Pose the question: 'Imagine the RBA observes rising inflation and falling unemployment. According to the short-run Phillips Curve, what policy action might they consider, and what are the potential risks of that action?' Facilitate a class discussion on the trade-offs involved.

Quick Check

Provide students with a simplified graph showing a downward-sloping Phillips Curve. Ask them to label two points: one representing high unemployment and low inflation, and another representing low unemployment and high inflation. Then, ask them to explain why this trade-off might not hold in the long run.

Exit Ticket

On an index card, ask students to write one sentence explaining the short-run Phillips Curve and one sentence explaining why the curve is considered vertical in the long run. Collect these to gauge individual understanding of the core concepts.

Frequently Asked Questions

How to explain the short-run Phillips Curve trade-off?

Use Australian ABS data to plot inflation against unemployment, showing the downward slope. Explain sticky wages: demand rises, firms hire more but prices lag initially. Connect to RBA dual mandate for balance. Hands-on graphing reveals patterns students internalize better than lectures.

What are the policy implications of the Phillips Curve?

Policymakers trade short-run gains: expansionary policy cuts unemployment but risks inflation. Long-run focus shifts to credible targets like 2-3% inflation. Students analyze RBA decisions, weighing costs of volatility in employment versus price stability for sustainable growth.

How can active learning help students understand the Phillips Curve?

Activities like data plotting and policy debates make abstract trade-offs concrete. Students graphing real ABS data see short-run links, while simulations of expectations show long-run verticality. Collaborative critique of stagflation cases builds critical analysis, outperforming passive reading by engaging multiple senses and peer discussion.

Why does the long-run Phillips Curve become vertical?

Workers and firms adjust expectations: anticipated inflation embeds in wages, neutralizing unemployment gains. Evidence from 1970s Australia shows accelerating inflation without jobs. Teach via timelines: short-run curves shift up until vertical at natural rate, emphasizing credible policy for stability.