Inflation Notes

Inflation

Core Problems of Inflation

  • Inflation is recognized as a significant macroeconomic problem.

  • Key questions include:

    • What types of price increases qualify as inflation?

    • Who benefits and who is harmed by inflation?

    • What constitutes an appropriate goal for price stability?

Runaway Inflation Examples

  • Germany (1923): Prices doubled every day, causing economic collapse, halting of production, increased unemployment (by a factor of 10), and ultimately contributing to Hitler's rise to power.

  • Zimbabwe (2007-2010): Experienced a similar economic disaster due to runaway inflation.

Exercise: Price Doubling

  • If a good's price doubles daily, its price in 10 days will be $512 and in 20 days will be $524,288.

Defining Inflation and Deflation

  • Inflation: An increase in the average level of prices, not just a specific good's price.

  • The prices of specific basket of goods are collected and computed into an average price level for that basket in a year.

  • A rise in the average price level is inflation, while a decrease is deflation.

Relative Prices vs. Inflation

  • Relative Price: The price of one good compared to another; this is an essential market function as buyers switch goods when relative prices diverge.

  • Inflation is different from relative prices; it's a rise in the average price of all goods and not a market function.

Effects of Inflation

  • Inflation causes some prices to rise while others fall.

  • Consumers must reallocate purchasing power to maximize satisfaction per dollar spent, potentially reducing purchases of goods with higher prices and increasing purchases of goods with lower prices.

  • Nominal income and real income are impacted:

    • Nominal Income: The amount of money income received in a given period, measured in current dollars.

    • Real Income: Income adjusted for inflation, reflecting constant dollars.

    • A raise (increase in nominal income) doesn't guarantee increased purchasing power (real income) if inflation rises faster.

Redistributive Effects of Inflation

  • Inflation causes a redistribution of income and wealth, making some people worse off and others better off.

  • This redistribution occurs through:

    • Price Effects:

      • Those buying products increasing fastest in price are worse off.

      • Those selling products increasing fastest in price are better off.

      • Those buying products increasing slowest in price are better off.

      • Those selling products increasing slowest in price are worse off.

    • Income Effects:

      • People with nominal incomes rising more slowly than inflation are worse off.

      • People with nominal incomes rising faster than inflation are better off.

    • Wealth Effects:

      • Those owning assets declining in real value are worse off.

      • Those owning assets increasing in real value are better off.

Money Illusion

  • Money Illusion: The tendency to use nominal dollars rather than real dollars to assess changes in income or wealth.

  • Example comparing movie ticket prices and minimum wage in the "good old days" versus today illustrates the concept.

  • Exercise: If inflation in 1980 was 13.5% and income increased by 10%, purchasing power decreased because prices rose faster than income.

Macro Consequences of Inflation

  • Uncertainty: Future price uncertainty complicates purchasing and production decisions.

  • Speculation: Economic activity shifts towards betting on future prices rather than standard economic activities.

  • Bracket Creep: In progressive tax systems, nominal income increases can push taxpayers into higher tax brackets.

Hyperinflation

  • Hyperinflation: Exceeds 200% per year, leading to accelerated spending and declining production.

Deflation

  • Deflation: A general decrease in average prices, leading to opposite redistribution effects of inflation.

  • Sellers become reluctant to stock inventory, buyers delay purchases, businesses hesitate to borrow or invest, and incomes and asset values fall.

Measuring Inflation

  • Measuring inflation serves two primary purposes:

    • To gauge the average rate of inflation.

    • To identify its principal victims.

Consumer Price Index (CPI)

  • Consumer Price Index (CPI): A measure of the average price of consumer goods and services, used to calculate the inflation rate.

  • Inflation Rate: The annual percentage rate of increase in the average price level.

Creating a Price Index

  • Steps:

    1. Select a "market basket" of goods that consumers typically buy.

    2. Choose a base year as the reference year.

    3. Set the price index in the base year to 100.

    4. Measure prices for the basket of goods in the current year and the base year.

Computing a Price Index

  • Formula: Price index in current yearPrice index in base year=Basket price in current yearBasket price in base year\frac{\text{Price index in current year}}{\text{Price index in base year}} = \frac{\text{Basket price in current year}}{\text{Basket price in base year}}

  • Example:

    • Base year basket price: $12,000.

    • Current year basket price: $13,200.

    • CPI Calculation: X100=13,20012,000\frac{X}{100} = \frac{13,200}{12,000}, therefore, X=(13,200×100)12,000=110X = \frac{(13,200 \times 100)}{12,000} = 110

    • A CPI of 110 indicates prices are 10% higher than in the base year.

CPI Examples

  • CPI was approximately 200 in 2006, and 100 in the base year 1983, indicating prices doubled between 1983 and 2006.

  • If CPI was about 50 in 1974, prices doubled between 1974 and 1983.

Other Measures of Inflation

  • Core Inflation: Changes in the CPI excluding volatile food and energy prices.

  • Producer Price Index (PPI): Tracks changes in average prices at intermediate production stages.

  • GDP Deflator: Measures changes in prices of all goods and services included in GDP; used to adjust nominal GDP to real GDP.

Computing Inflation Rate from CPI

  • Formula: Inflation rate=CPI year 2 – CPI year 1CPI year 1×100\text{Inflation rate} = \frac{\text{CPI year 2 – CPI year 1}}{\text{CPI year 1}} \times 100

  • Example: If CPI in 2006 was 201.6 and in 2005 was 195.3, then the inflation rate for 2006 is: (201.6−195.3)195.3×100=3.23%\frac{(201.6 - 195.3)}{195.3} \times 100 = 3.23\%

The Goal: Price Stability

  • Price Stability: Absence of significant changes in the average price level; officially defined as inflation less than 3% per year, established by the Full Employment and Balanced Growth Act of 1978.

  • Measurement concerns include seeking price stability at the lowest unemployment rate, accounting for quality improvements, and the changing composition of goods in the basket.

Causes of Inflation

  • Demand-Pull Inflation: Results from excessive pressure to buy, driven by a booming economy creating shortages or excessive money supply by the Federal Reserve.

  • Cost-Push Inflation: Results from higher production costs that pressure suppliers to increase prices.

Protective Mechanisms

  • Cost of Living Allowances (COLA): Nominal incomes are indexed to rise automatically with inflation.

  • Adjustable-Rate Mortgage (ARM): Interest rates on mortgages increase with inflation to protect lenders.

Real Interest Rate

  • Real Interest Rate: The nominal interest rate minus the anticipated inflation rate; protects lenders but hurts borrowers.

  • Formula: Real interest rate=Nominal interest rate–Anticipated rate of inflation\text{Real interest rate} = \text{Nominal interest rate} – \text{Anticipated rate of inflation}

  • Borrowers repay loans with lower-valued dollars, but lenders still receive the same purchasing power.

Application: The Economy Tomorrow

  • A small amount of inflation may be beneficial to encourage spending.

  • Challenge is to find the optimal inflation rate that encourages spending without risking an inflationary flashpoint.

  • Inflationary Flashpoint: The output rate at which inflationary pressures intensify.

Revisiting Learning Objectives

  • LO7-1: How Inflation is Measured: Inflation is measured by changes in a price index, such as the CPI.

  • LO7-2: Why Inflation is a Socioeconomic Problem: Inflation redistributes income by altering relative prices, income, and wealth, creating uncertainty and speculation and detracting from productive activity. COLAs and ARMs help protect some people from inflation.

  • **LO7-3: Meaning of