Ch17: Inflation

Meaning and Measurement of Inflation

Inflation: An increase in the general (average) price level of goods and services in the economy.

• Simple: Things become more expensive, so your money buys less than it used to.

• Inflation means the average prices of goods and services are increasing overall, not just the price of one particular product.

Deflation: A decrease in the general (average) price level of goods and services in the economy

• Simple: Things generally become cheaper over time.

Disinflation: a reduction in the rate of inflation.

• Simple: prices are still increasing, but they are increasing more slowly than before.

Consumer Price Index (CPI): Concept and Composition

• Consumer Price Index (CPI): an index that measures changes in the average prices of consumer goods and services.

• Simple: tracks how the average prices of goods and services that consumers buy change over time.

• Purpose: The CPI is the most widely reported and tracked measure of inflation.

• Distinction Between CPI and the GDP Chain Price Index:

• The CPI measures only consumer goods and services to determine how rising prices affect the purchasing power of consumers’ incomes.It does not include items bought by businesses or the government.

• Examples of what it excludes:

  • Businesses: Machines and equipment bought by companies.

  • Government: Military equipment and supplies bought by the government.

• Data Collection and Index Preparation:

  • The CPI is calculated and reported monthly by the Bureau of Labor Statistics (BLS) of the U.S. Department of Labor.

  • Monthly price collectors from the BLS contact retail establishments, service providers, homeowners, and tenants across selected U.S. cities.

  • The BLS uses these prices to track the average cost of a market basket—a group of goods and services that a typical urban family buys.

  • In simple words: The BLS checks prices each month to see how much everyday items cost and how those prices change over time.

• Market Basket Category Breakdown:

CPI Calculation and Example Economy

• Base Year Definition and Properties:

  • A base year is a year chosen as a reference point for comparison

    with some earlier or later year.

  • In simple words: It is the year you use as a reference to see how things have changed over time.

    Example: If 2020 is the base year, you compare prices in 2020 with prices in 2025 to see how much prices have increased or decreased.

  • The base year index value is always $100$ because the numerator and the denominator of the index formula are the same in the base year

  • Side note: The CPI in the base year is always 100 because the cost of the market basket in the base year is divided by itself, so the answer is 1, or 100 when multiplied by 100.

• Standard Mathematical Formula for CPI:

  • $\text{CPI} = \left(\frac{\text{Cost of market basket of products at current-year prices}}{\text{Cost of same market basket of products at base-year prices}}\right) \times 100$

• Hypothetical Three-Product Economy Model:

• Hamburgers:

  • $1982$ Quantity Purchased: $50$

  • $1982$ Base Price: $\$0.80$

  • $1982$ Total Cost: $50 \times \$0.80 = \$40$

  • $2022$ Current Price: $\$1.50$

  • $2022$ Total Cost: $50 \times \$1.50 = \$75$

• Gallons of Gasoline:

  • $1982$ Quantity Purchased: $250$

  • $1982$ Base Price: $\$0.70$

  • $1982$ Total Cost: $250 \times \$0.70 = \$175$

  • $2022$ Current Price: $\$3.20$

  • $2022$ Total Cost: $250 \times \$3.20 = \$800$

• Jeans:

  • $1982$ Quantity Purchased: $2$

  • $1982$ Base Price: $\$15.00$

  • $1982$ Total Cost: $2 \times \$15.00 = \$30$

  • $2022$ Current Price: $\$25.00$

  • $2022$ Total Cost: $2 \times \$25.00 = \$50$

• Basket Aggregation:

  • Total $1982$ Base Year Market Basket Cost: $\$40 + \$175 + \$30 = \$245$

  • Total $2022$ Current Year Market Basket Cost: $\$75 + \$800 + \$50 = \$925$

• Calculated Current Index:

  • $2022\text{ CPI} = \left(\frac{\$925}{\$245}\right) \times 100 = 377.6$

Measuring Inflation and Historical Fluctuations

• Annual Inflation Rate Formula:

  • The inflation rate represents the percentage change in the CPI from one year to the next:

  • In simple words: you compare this year's CPI with last year's CPI to see how much prices have increased or decreased as a percentage.

  • $\text{Annual inflation rate} = \left(\frac{\text{CPI in given year} - \text{CPI in previous year}}{\text{CPI in previous year}}\right) \times 100$

Criticisms and Limitations of the CPI

• 1. Market basket may not represent everyone.

• Different people buy different things, so inflation may affect groups differently.

• Example: College students may spend more on rent, while families may spend more on groceries.

  2. Difficulty adjusting for quality changes.

• Products can improve over time, making it hard to tell whether a price increase is due to inflation or better quality.

• Example: A new phone costs more because it has a better camera and more features.

  3. Doesn't fully consider how important items are.

• Price changes in items people buy often or need a lot can affect them more than changes in items they rarely buy.

• Example: A big increase in grocery prices may affect people more than an increase in the price of movie tickets.

Consequences of Inflation

• Standard of Living and Purchasing Power:

  • Inflation can lower your standard of living because your money buys fewer things.

    • Inflation: Prices of goods and services increase.

    • Purchasing power: How much you can buy with your money.

    • Nominal income: The amount of money you earn.

• Nominal vs. Real Income Definitions:

  • Nominal Income: The actual amount of money you earn over a period of time, without adjusting for inflation.

  • Ex: If you earn $500 per week, your nominal income is $500 per week.

  • Real Income: The actual number of dollars received adjusted for changes in the price level (CPI).

  • Simple example:

    • You earn $1,000 per month (nominal income).

    • Prices increase because of inflation.

    • Your $1,000 now buys fewer things, so your real income decreases.

• Mathematical Formulas for Real Income:

  • $\text{Real income} = \frac{\text{Nominal income}}{\text{CPI expressed as a decimal}}$

  • $\text{Percentage change in real income} = \text{Percentage change in nominal income} - \text{Percentage change in CPI}$

• Remember:

  • If CPI is written as 125, divide by 125 and by 100.

  • If CPI is written as 1.25, just divide by 1.25.

• Purchasing power and inflation:

  • Whether your purchasing power increases or decreases depends on how fast your income rises compared with inflation.

    • Income rises faster than inflation: You gain purchasing power because you can afford more things.

    • Income rises slower than inflation: You lose purchasing power because your money buys fewer things.

    • Income rises at the same rate as inflation: Your purchasing power stays about the same.

Effects of Inflation on Wealth, Interest Rates, and Debt

• Wealth Effects:

  • Wealth: The value of the stock of assets owned at a specific point in time.

  • Examples of assets:

    • Money in your bank account

    • A house or car

    • Stocks and investments

    Simple example: If you own $5,000 in savings, a $200,000 house, and $10,000 in investments, your wealth from these assets is $215,000 (before subtracting any debts).

  • How is wealth affected by inflation:

  • Inflation can affect people differently depending on whether they already own valuable assets.

    • People who own assets may benefit: The value of things they own, such as houses or land, may increase as prices rise.

    • People who don't own assets may struggle: Houses and other assets become more expensive, making them harder to afford.

• Nominal vs. Real Interest Rates:

• Nominal Interest Rate: The actual rate of interest without adjustment for the

  inflation rate.

  • Real Interest Rate: The nominal rate of interest minus the rate of inflation.

  • Rember: The real interest rate tells you how much you gain after accounting for inflation.

  • $\text{Real interest rate} = \text{Nominal interest rate} - \text{Inflation rate}$

  • A negative real interest rate means inflation is higher than the interest rate you earn.

    - Lenders and savers lose purchasing power because their money grows slower than prices increase.

• Adjustable-Rate Mortgages (ARMs):

Interest rate can change.

Monthly payments may increase or decrease.

Example: Rate starts at 4%, then may rise to 5%.

• Fixed-Rate Mortgage

Interest rate stays the same.

Monthly payments are more predictable.

Example: Rate stays at 4%.

Hyperinflation Dynamics and Systemic Failures

• Hyperinflation Definition:

  • Is when prices rise extremely fast in a short amount of time.

• Major Economic Outcomes of Hyperinflation:

  • Inflation Psychosis: Is when people spend their money right away because they expect prices to keep rising.

    Example: You buy groceries today because you think they will cost more tomorrow.

  • Credit Market Collapses: When lenders stop lending money because they fear the money they get paid back later will be worth much less due to inflation.

  • Simple explanation:

    • Prices are rising very quickly.

    • Money is losing its purchasing power.

    • Lenders worry that the money borrowers repay in the future will buy fewer goods and services.

    • Lenders stop giving out short-term and long-term loans.

  • Wage-Price Spiral: Happens when wages and prices keep increasing because they cause each other to rise.

    Example:

    1. Workers get higher wages.

    2. Businesses raise prices to cover the higher costs.

    3. Workers ask for even higher wages because things cost more.

    4. Businesses raise prices again.

  • Speculation: People stop focusing on producing goods and services and instead focus on buying and holding valuable assets because they expect prices to rise.

  • Simple explanation:

    • Inflation is making money lose value.

    • People worry their money will be worth less in the future.

    • They spend time and resources buying assets, such as gold, houses, or land, to protect their wealth.

    • Less time and effort go toward productive activities, like making products or providing services

Two basic types of inflation

• Demand-Pull Inflation: A rise in the general price level resulting from an excess of total spending (demand).

• Simple: happens when people want to buy more goods and services than businesses can produce, causing prices to rise.

Example: Imagine everyone wants to buy a new car, but car companies don't have enough cars available. Because demand is so high, car companies raise their prices.

Demand-pull inflation occurs when the economy is at or near full employment, meaning most people who want jobs have them and businesses are producing close to their maximum capacity.

• Cost-Push Inflation: An increase in the general price level resulting from an

  increase in the cost of production

• Simple explanation

  • Businesses pay more for materials, workers, or transportation.

  • It becomes more expensive to produce goods.(wages, raw materials, energy, or capital financing costs)

  • Businesses raise their prices to cover the higher costs.

  • Consumers end up paying more.

• Influence of Future Expectations on Inflation:

  • Buyer Expectations (Demand-Pull Channel): Consumers expect prices to rise, so they buy things now instead of waiting until later.

    Simple explanation

    1. Buyers expect prices to increase soon.

    2. They rush to buy things today.

    3. Total demand in the economy increases.

    4. If the economy is near full employment, businesses may not be able to produce enough extra goods.

    5. Prices rise, causing demand-pull inflation.

Example: You hear that laptops will cost more next month, so you buy one today. Many other people do the same thing, increasing demand and pushing prices up.

• Firm Expectations (Cost-Push Channel): Businesses expect it will cost more to make their products in the future, so they raise prices now to prepare for those higher costs.

• Simple explanation

  1. Businesses expect production costs to increase.

  2. They raise their prices today.

  3. Consumers pay more for goods and services.

  4. The general price level rises, causing cost-push inflation.

Example: A bakery expects flour and electricity to become more expensive next month, so it raises the price of bread today to prepare for those costs.