Study Notes on Chapter 8: Inflation and Deflation
Chapter 8: Inflation and Deflation
Intro to Macroeconomics
Professor: Prof. Nicar
Institution: TCU Economics
Consumer Price Index (CPI)
CPI Price Level
Source: U.S. Bureau of Labor Statistics via FRED®
Index Reference: 1982-1984 = 100
Graph Summary:
Displays changes in the Consumer Price Index for All Urban Consumers in the U.S. City Average from 1950 to 2020.
Vertical axis labeled as the CPI index values, showing significant trends and adjustments.
Shaded areas on the graph indicate periods of U.S. recessions.
CPI Annual Inflation Rate
Source: U.S. Bureau of Labor Statistics via FRED®
Graph Summary:
Represents annual percentage change from year to year.
Covers the same time span (1950-2020) with significant implications during recession periods.
Percent change tracked annually in relation to CPI values; illustrates spikes and declines, highlighting economic trends.
Historical Context
The Great Depression:
Last significant period of deflation in U.S. history.
Consumer prices decreased by 30% over several years during this economic downturn.
Post-Great Depression:
Predominantly observed inflation leading to continuous price level increases over time.
U.S. vs. Japan: Inflation Experiences
Graph Comparison:
Underlines different patterns of consumer price changes between the U.S. and Japan since 1970.
Historical CPI index comparison shows divergent inflation trends and economic responses from both nations.
Inflation and Consumers' Purchasing Power
Cost Implications:
Both inflation and deflation incur costs on the economy, albeit in varying manners.
The chapter primarily centers on inflation implications rather than deflation.
Perspectives on Inflation
Are Inflation and Deflation Problems?
General Consensus:
While both are seen as economic issues, the chapter emphasizes inflation.
The concept of inflation reducing purchasing power primarily when prices rise faster than incomes.
When is Inflation Not a Problem?
Inflation Dynamics:
Inflation may not be a problem if nominal income rises proportionately or faster than prices.
Focus should shift from the absolute price levels to the changes in real income.
Nominal vs. Real Income
Definitions:
Nominal Income: Income expressed in monetary terms, e.g., a wage of $20 per hour.
Real Income: Represents purchasing power; nominal income adjusted for price levels.
Emphasizes understanding the actual value of money regarding goods and services.
Calculation Example of Real Wage
Scenario:
Nominal wage: $20 per hour.
Price of a cheese pizza: $20.
Real Wage Calculation:
Changes in the Real Wage
Price Increase Scenario
Initial Conditions:
Increase in cheese pizza price by 10% to $22.
Nominal wage remains at $20 per hour.
New Real Wage Calculation:
Real Wage Post-Raise Scenario
Change:
Increased nominal wage to $22 per hour; price of pizza remains at $22.
Real Wage Calculation After Raise:
Inflation and Purchasing Power Impact
Core Insight:
Inflation erodes purchasing power primarily if nominal wages stagnate or fail to keep up with rising prices.
The critical measure to assess economic health is through real wage analysis rather than mere inflation or nominal wage figures.
Median Income and CPI Trends (1979 - 2025)
Graph Dynamics:
Comparison of median nominal income against price levels.
Highlights economic trends and real income developments anticipated over the coming years.
Real Income Trends in the U.S.
Long-Run Observations
Nominal Income Trends:
Observations indicate nominal income generally surpasses price increases over extended periods.
Short-Run Fluctuations:
In contrast, short-term periods may show accelerated price increases compared to wage rises, hence affecting real income.
Relative Price Change:
Fluctuations in relative prices of goods over time represent additional considerations that obscure overall price level assessments.