Inflation & Unemployment
Inflation and unemployment are two of the most closely watched macroeconomic indicators. Inflation measures the rate at which the general price level rises, eroding purchasing power, while unemployment measures the share of the labor force that is jobless and actively seeking work.
This guide covers the types and measurement of inflation (CPI, demand-pull, cost-push, built-in), types of unemployment (frictional, structural, cyclical), the Phillips Curve (short-run and long-run), NAIRU, worked examples, and a 10-question practice quiz.
1Introduction
The relationship between inflation and unemployment is one of the most important and debated topics in macroeconomics. Understanding how these two variables interact — and the trade-offs policymakers face — is essential for analyzing monetary and fiscal policy decisions.
Inflation erodes the purchasing power of money, distorts price signals, and creates uncertainty in the economy. Unemployment represents wasted human resources, lost output, and personal hardship. The Phillips Curve framework examines whether policymakers can exploit a short-run trade-off between these two variables, and what happens in the long run as expectations adjust.
Post-Pandemic Inflation (2021–2023): Following the COVID-19 pandemic, many economies experienced surging inflation driven by supply-chain disruptions, pent-up demand fueled by fiscal stimulus, and energy price shocks. Central banks responded with aggressive interest rate hikes, reigniting debates about the Phillips Curve trade-off and whether reducing inflation would require significant increases in unemployment.
2Key Definitions
Essential terms for understanding inflation, unemployment, and their relationship at the university level.
Consumer Price Index (CPI)
A measure of the average change in prices paid by consumers for a fixed basket of goods and services over time
Inflation Rate
The percentage change in the general price level over a specific period, typically measured using CPI or GDP deflator
Demand-Pull Inflation
Inflation caused by increases in aggregate demand that outpace aggregate supply — “too much money chasing too few goods”
Cost-Push Inflation
Inflation caused by increases in production costs (wages, raw materials) that shift aggregate supply leftward
Built-In Inflation
Inflation driven by adaptive expectations; workers demand higher wages anticipating future inflation, creating a wage-price spiral
Frictional Unemployment
Short-term unemployment arising from the normal process of job searching, career transitions, and labor market matching
Structural Unemployment
Unemployment caused by a mismatch between workers' skills and available jobs, often due to technological change or industry shifts
Cyclical Unemployment
Unemployment caused by downturns in the business cycle; rises during recessions and falls during expansions
NAIRU
Non-Accelerating Inflation Rate of Unemployment — the unemployment rate at which inflation neither accelerates nor decelerates
Phillips Curve
A model showing the inverse relationship between inflation and unemployment in the short run; vertical at NAIRU in the long run
Disinflation
A decline in the rate of inflation; prices are still rising, but at a slower pace than before
Stagflation
A combination of stagnant economic growth, high unemployment, and high inflation — typically caused by supply shocks
3Understanding Inflation
Inflation is a sustained increase in the general price level. It is not about individual prices rising, but about the overall price level trending upward over time.
Types of Inflation
Demand-Pull Inflation
Occurs when aggregate demand (AD) increases faster than aggregate supply. Causes include expansionary fiscal/monetary policy, rising consumer confidence, or export booms. Shown as a rightward shift of AD in the AD-AS model.
Cost-Push Inflation
Occurs when production costs rise, reducing aggregate supply. Causes include rising oil prices, higher wages, supply-chain disruptions, or increased regulation. Shown as a leftward shift of AS in the AD-AS model.
Built-In (Wage-Price) Inflation: Workers expect prices to rise and negotiate higher wages. Higher wages increase production costs, leading firms to raise prices, which validates the original expectation. This self-reinforcing cycle is also called the wage-price spiral.
Measuring Inflation: The CPI
CPI Formula:
CPI = (Cost of basket in current year / Cost of basket in base year) × 100
Inflation Rate: Inflation Rate = ((CPIcurrent − CPIprevious) / CPIprevious) × 100
Costs of Inflation
Shoe Leather Costs: The time and effort people spend on more frequent financial transactions to minimize holding cash that is losing value
Menu Costs: The costs firms incur when changing their listed prices — reprinting menus, catalogs, labels, and updating systems
Tax Distortions: Inflation can push taxpayers into higher brackets (bracket creep) and distort capital gains taxes by taxing nominal rather than real gains
Arbitrary Redistribution: Unexpected inflation redistributes wealth from lenders to borrowers (real value of debt falls) and from fixed-income earners to flexible-income earners
Uncertainty: High or variable inflation makes long-term planning difficult, discouraging investment and saving
Fisher Equation:
r = i − π — Real interest rate = Nominal interest rate − Inflation rate
4Understanding Unemployment
Unemployment occurs when individuals who are willing and able to work are unable to find employment. The unemployment rate is the percentage of the labor force that is unemployed.
Types of Unemployment
Frictional Unemployment
Normal, short-term unemployment from people transitioning between jobs, entering the workforce, or searching for better matches. Exists even in a healthy economy.
Structural Unemployment
Longer-term unemployment caused by a mismatch between workers' skills and job requirements. Results from technological change, globalization, or shifts in industry composition.
Cyclical Unemployment
Unemployment caused by economic downturns and recessions. When aggregate demand falls, firms reduce output and lay off workers. This is the type of unemployment that policymakers most directly target with demand-side policies.
Calculating the Unemployment Rate
Unemployment Rate = (Number of Unemployed / Labor Force) × 100
Labor Force = Employed + Unemployed
Labor Force Participation Rate: LFPR = (Labor Force / Working-Age Population) × 100
Discouraged Workers: People who have stopped looking for work because they believe no jobs are available. They are not counted in the labor force or unemployment rate, which can understate the true level of joblessness.
Natural Rate of Unemployment (NAIRU): The unemployment rate that exists when the economy is at “full employment.” It includes frictional and structural unemployment but excludes cyclical unemployment. At NAIRU, inflation is stable — neither accelerating nor decelerating.
5The Phillips Curve
The Phillips Curve describes the relationship between inflation and unemployment. It is central to macroeconomic policy analysis and has evolved significantly since its original formulation.
Original Phillips Curve
In 1958, A.W. Phillips observed an inverse relationship between wage inflation and unemployment in the UK. This was later adapted to show a trade-off between price inflation and unemployment — suggesting policymakers could “choose” a point on the curve.
Short-Run Phillips Curve (SRPC)
The expectations-augmented Phillips Curve incorporates inflation expectations. In the short run, there is a trade-off between inflation and unemployment because expectations are slow to adjust.
Expectations-Augmented Phillips Curve:
π = πe − β(u − un)
- π: Actual inflation rate
- πe: Expected inflation rate
- u: Actual unemployment rate
- un: Natural rate of unemployment (NAIRU)
- β: Sensitivity of inflation to the unemployment gap
SRPC Shifts Right/Up
Caused by an increase in inflation expectations or a negative supply shock (e.g., oil price spike). At any given unemployment rate, inflation is higher.
SRPC Shifts Left/Down
Caused by a decrease in inflation expectations or a positive supply shock (e.g., technological breakthrough). At any given unemployment rate, inflation is lower.
Long-Run Phillips Curve (LRPC)
In the long run, expectations fully adjust to actual inflation. There is no trade-off between inflation and unemployment — the LRPC is a vertical line at NAIRU. Attempts to push unemployment permanently below NAIRU will only result in ever-accelerating inflation.
Key Insight: In the long run, u = un at any inflation rate.
The LRPC is vertical at the natural rate of unemployment. Monetary policy can influence inflation in the long run, but not the unemployment rate.
6Worked Examples
Example 1: Unemployment Rate Calculation
Given: Working-age population = 200 million, Employed = 150 million, Unemployed = 10 million
Labor Force = Employed + Unemployed
Labor Force = 150M + 10M = 160 million
Unemployment Rate = (Unemployed / Labor Force) × 100
Unemployment Rate = (10M / 160M) × 100 = 6.25%
LFPR = (Labor Force / Working-Age Population) × 100
LFPR = (160M / 200M) × 100 = 80%
Example 2: CPI & Inflation Rate Calculation
A consumer basket costs
