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7 measuring the cost of living
1.
Copyright©2004 South-Western 77Measuring the
Cost of Living
2.
Copyright©2004 South-Western Measuring the
Cost of Living • InflationInflation refers to a situation in which the economy’s overall price level is rising. • The inflation rateinflation rate is the percentage change in the price level from the previous period.
3.
Copyright©2004 South-Western THE CONSUMER
PRICE INDEX • The consumer price index (CPI) is a measure of the overall cost of the goods and services bought by a typical consumer. • The Bureau of Labor Statistics reports the CPI each month. • It is used to monitor changes in the cost of living over time.
4.
Copyright©2004 South-Western THE CONSUMER
PRICE INDEX • When the CPI rises, the typical family has to spend more dollars to maintain the same standard of living.
5.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Fix the Basket: Determine what prices are most important to the typical consumer. • The Bureau of Labor Statistics (BLS) identifies a market basket of goods and services the typical consumer buys. • The BLS conducts monthly consumer surveys to set the weights for the prices of those goods and services.
6.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Find the Prices: Find the prices of each of the goods and services in the basket for each point in time.
7.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Compute the Basket’s Cost: Use the data on prices to calculate the cost of the basket of goods and services at different times.
8.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Choose a Base Year and Compute the Index:Choose a Base Year and Compute the Index: • Designate one year as the base year, making it the benchmark against which other years are compared. • Compute the index by dividing the price of the basket in one year by the price in the base year and multiplying by 100.
9.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Compute the inflation rate: The inflation rate is the percentage change in the price index from the preceding period.
10.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • The Inflation Rate • The inflation rate is calculated as follows: I n f l a t i o n R a t e i n Y e a r 2 = C P I i n Y e a r 2 - C P I i n Y e a r 1 C P I i n Y e a r 1 × 1 0 0
11.
Table 1 Calculating
the Consumer Price Index and the Inflation Rate: An Example Copyright©2004 South-Western
12.
Table 1 Calculating
the Consumer Price Index and the Inflation Rate: An Example Copyright©2004 South-Western
13.
Table 1 Calculating
the Consumer Price Index and the Inflation Rate: An Example Copyright©2004 South-Western
14.
Table 1 Calculating
the Consumer Price Index and the Inflation Rate: An Example Copyright©2004 South-Western
15.
Table 1 Calculating
the Consumer Price Index and the Inflation Rate: An Example Copyright©2004 South-Western
16.
Copyright©2004 South-Western How the
Consumer Price Index Is Calculated • Calculating the Consumer Price Index and the Inflation Rate: Another Example • Base Year is 2002. • Basket of goods in 2002 costs $1,200. • The same basket in 2004 costs $1,236. • CPI = ($1,236/$1,200) × 100 = 103. • Prices increased 3 percent between 2002 and 2004.
17.
FYI: What’s in
the CPI’s Basket? 16% Food and beverages 17% Transportation Medical care 6% Recreation 6% Apparel 4% Other goods and services 4% 41% Housing 6% Education and communication Copyright©2004 South-Western
18.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • The CPI is an accurate measure of the selected goods that make up the typical bundle, but it is not a perfect measure of the cost of living.
19.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • Substitution bias • Introduction of new goods • Unmeasured quality changes
20.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • Substitution Bias • The basket does not change to reflect consumer reaction to changes in relative prices. • Consumers substitute toward goods that have become relatively less expensive. • The index overstates the increase in cost of living by not considering consumer substitution.
21.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • Introduction of New Goods • The basket does not reflect the change in purchasing power brought on by the introduction of new products. • New products result in greater variety, which in turn makes each dollar more valuable. • Consumers need fewer dollars to maintain any given standard of living.
22.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • Unmeasured Quality Changes • If the quality of a good rises from one year to the next, the value of a dollar rises, even if the price of the good stays the same. • If the quality of a good falls from one year to the next, the value of a dollar falls, even if the price of the good stays the same. • The BLS tries to adjust the price for constant quality, but such differences are hard to measure.
23.
Copyright©2004 South-Western Problems in
Measuring the Cost of Living • The substitution bias, introduction of new goods, and unmeasured quality changes cause the CPI to overstate the true cost of living. • The issue is important because many government programs use the CPI to adjust for changes in the overall level of prices. • The CPI overstates inflation by about 1 percentage point per year.
24.
Copyright©2004 South-Western The GDP
Deflator versus the Consumer Price Index • The GDP deflator is calculated as follows: G D P d e f l a t o r = N o m i n a l G D P R e a l G D P × 1 0 0
25.
Copyright©2004 South-Western The GDP
Deflator versus the Consumer Price Index • The BLS calculates other prices indexes: • The index for different regions within the country. • The producer price index, which measures the cost of a basket of goods and services bought by firms rather than consumers.
26.
Copyright©2004 South-Western The GDP
Deflator versus the Consumer Price Index • Economists and policymakers monitor both the GDP deflator and the consumer price index to gauge how quickly prices are rising. • There are two important differences between the indexes that can cause them to diverge.
27.
Copyright©2004 South-Western The GDP
Deflator versus the Consumer Price Index • The GDP deflator reflects the prices of all goods and services produced domestically, whereas... • …the consumer price index reflects the prices of all goods and services bought by consumers.
28.
Copyright©2004 South-Western The GDP
Deflator versus the Consumer Price Index • The consumer price index compares the price of a fixed basket of goods and services to the price of the basket in the base year (only occasionally does the BLS change the basket)... • …whereas the GDP deflator compares the price of currently produced goods and services to the price of the same goods and services in the base year.
29.
Figure 2 Two
Measures of Inflation 1965 Percent per Year 15 CPI GDP deflator 10 5 0 1970 1975 1980 1985 1990 20001995 Copyright©2004 South-Western
30.
Copyright©2004 South-Western CORRECTING ECONOMIC
VARIABLES FOR THE EFFECTS OF INFLATION • Price indexes are used to correct for the effects of inflation when comparing dollar figures from different times.
31.
Copyright©2004 South-Western Dollar Figures
from Different Times • Do the following to convert (inflate) Babe Ruth’s wages in 1931 to dollars in 2001: S a l a r y S a l a r y P r i c e l e v e l i n 2 0 0 1 P r i c e l e v e l i n 1 9 3 1 2 0 0 1 1 9 3 1= × = × = $ 8 0 , . $ 9 3 1 , 0 0 0 1 7 7 1 5 2 5 7 9
32.
Table 2 The
Most Popular Movies of All Times, Inflation Adjusted Copyright©2004 South-Western
33.
Copyright©2004 South-Western Indexation • When
some dollar amount is automatically corrected for inflation by law or contract, the amount is said to be indexed for inflation.
34.
Copyright©2004 South-Western Real and
Nominal Interest Rates • Interest represents a payment in the future for a transfer of money in the past.
35.
Copyright©2004 South-Western Real and
Nominal Interest Rates • The nominal interest rate is the interest rate usually reported and not corrected for inflation. • It is the interest rate that a bank pays. • The real interest rate is the nominal interest rate that is corrected for the effects of inflation.
36.
Copyright©2004 South-Western Real and
Nominal Interest Rates • You borrowed $1,000 for one year. • Nominal interest rate was 15%. • During the year inflation was 10%. Real interest rate = Nominal interest rate – Inflation = 15% - 10% = 5%
37.
Figure 3 Real
and Nominal Interest Rates 1965 Interest Rates (percent per year) 15 Real interest rate 10 5 0 –5 1970 1975 1980 1985 1990 1995 2000 Nominal interest rate Copyright©2004 South-Western
38.
Copyright©2004 South-Western Summary • The
consumer price index shows the cost of a basket of goods and services relative to the cost of the same basket in the base year. • The index is used to measure the overall level of prices in the economy. • The percentage change in the CPI measures the inflation rate.
39.
Copyright©2004 South-Western Summary • The
consumer price index is an imperfect measure of the cost of living for the following three reasons: substitution bias, the introduction of new goods, and unmeasured changes in quality. • Because of measurement problems, the CPI overstates annual inflation by about 1 percentage point.
40.
Copyright©2004 South-Western Summary • The
GDP deflator differs from the CPI because it includes goods and services produced rather than goods and services consumed. • In addition, the CPI uses a fixed basket of goods, while the GDP deflator automatically changes the group of goods and services over time as the composition of GDP changes.
41.
Copyright©2004 South-Western Summary • Dollar
figures from different points in time do not represent a valid comparison of purchasing power. • Various laws and private contracts use price indexes to correct for the effects of inflation. • The real interest rate equals the nominal interest rate minus the rate of inflation.