Explore the connection between the economic indicators and real-world issues. These lessons typically can be done in one class period.


Consumer Economics, Consumer Price Index (CPI), Consumers, Deflation, Full Employment, Inflation, Monetary Policy, Money, Unemployment

Current Key Economic Indicators

as of November 30, -0001



The consumer price index (CPI) during the month of January increased by .5 percent (one-half of one percent). The rate of increase in the consumer price index over the past twelve months has been 1.9 percent.

In January, the core consumer price index, which excludes energy and food prices, in creased by 0.2 percent. The core index has increased by 1.1 percent over the last twelve months.

Compared to the history of inflation in the U.S., is this rate of inflation particularly high, low, or just about equal to previous levels?

Current inflation is higher   Current inflation is about the same   Current inflation is lower

[Answer for teachers. Current inflation, at least the rate over the last 12 months, is lower than what it was through out much of the 1970s and 1980s. However for the last decade inflation has been at about the current rate. See table 1.]

Table 1
Rate of Change in the Consumer Price Index
(fron December to December)
1994 1995 1996 1997 1998 Average 1994 to 2003 = 2.3%
2.6% 2.5% 3.3% 1.7% 1.6%
1999 2000 2001 2002 2003
2.7% 3.4% 1.6% 2.4% 1.9%

Information for Teachers

All paragraphs in italics will not appear in the student version of the inflation case study. This case builds upon the previous inflation case study. More advanced concepts and questions will be added throughout the fall semester.

The original press release can be found at .

This lesson uses several charts and tables. You may use these files to create student reproducables or overhead transparencies for use in your classroom.

Goals of the Case Study

The goals of the Inflation Case Studies are to provide teachers and students:

  • access to easily understood, timely interpretations of monthly announcements of rate of change in prices in the U.S. economy;
  • descriptions of major issues surrounding the data announcements;
  • brief analyses of historical perspectives;
  • questions and activities to use to reinforce and develop understanding of relevant concepts; and
  • a list of publications and resources that may benefit classroom teachers and students interested in exploring inflation.

Definitions of Inflation

Inflation is a continual increase in the overall level of prices. It is an increase in average prices that lasts at least a few months. The most widely reported measurement of inflation is the consumer price index (CPI). The CPI measures the cost of a fixed set of goods relative to the cost of those same goods in a previous year. Changes in the prices of those goods approximate changes in the overall level of prices paid by consumers.

Data Trends

In January, the Consumer Price Index increased by .5 percent, after increasing .2 percent in December and falling by -.2 percent in November. In January, increases in transportation costs and housing costs were largely responsible for the overall decrease. In fact, increases in prices of energy accounted for almost three-quarters of the increase. The prices of medical care also increased during the month.

The .5 percent increase is the most rapid monthly increase in prices in almost one year. However the increase over the last 12 months remains rather mild.

The core rate of inflation (.2 percent in January) represents the consumer price index without the influences of changes in the prices of food and energy, which can fluctuate widely from month to month. The January increase compares to a 0.1 percent increase in the core rate of inflation in December and no change in November. Core prices increased more slowly than the overall index due to the importance of the rapid rise in prices of energy.

Figure 1: Monthly Inflation in Consumer Prices at Annual Rates

Figure 1 shows recent inflation data reported for each month. It is obvious that the monthly inflation figures change a great deal and that rates of inflation are not exactly stable from one month to the next.

Figure 2: Monthly Core Inflation Rate (excludes food and energy) at Annual Rates

Figure 2 shows what happens to those numbers when averages over three month periods are reported instead of the inflation rates for a single month. Inflation increased in 1999 and 2000 when compared to1998, fell throughout muc

h of 2001, and then has increased in 2002. What is really quite obvious from Figure 2 is that the changes in inflation from month to month, even reporting the three-month averages, are much more dramatic from 2001 on, when compared to 1998, 1999, and 2000. The increased volatility is primarily due to fluctuations in the prices of oil and food. The core rate of inflation (excluding food and energy) gives a much better idea of longer-term trends and that is why it is often featured in news reports. See figure 3.

Figure 3: Inflation in Consumer Prices since 1970

Compared to the rates of inflation in the 1970s and much of the 1980s, the current rate of inflation is quite low. See figure 4 below. Few observers would describe the most recent rates as high and they are not, when compared to those of the past thirty years. Other observers would describe the current experience as no or zero inflation.

Figure 4: Inflation in Consumer PRices Since 1970

The Consumer Price Index

The seasonally adjusted consumer price index in January was 185.8. The price index was equal to 100 during the period from 1982 to 1984. The interpretation is that prices in market basket of goods purchased by the typical consumer increased from the 1982-1984 period to January 2004 by 85.8 percent.

Inflation is usually reported in newspapers and television news as percentage changes in the CPI on a monthly basis. For example, the CPI in January was 185.8, compared to 184.9 in December. The increase in prices from December to January was (185.8-184.9) / 184.9 = 0.0049 or a monthly inflation rate of .49 percent. It is reported to the nearest one-tenth of a percent, in this case, .5 percent. To convert this into an annual rate, you could simply multiply by 12. This approximates an annual inflation rate of (.5) (12) = 6.0 percent. A slightly more accurate measurement of the annual inflation rate is to compound the monthly rate, or raise the monthly rate of increase, plus one, to the 12th power, which in this case give the same result.

How the Annual Inflation Rate is Calculated


Price Level

Monthly Inflation Rate

Annual Inflation Rate

January 185.8

= .0049 or .5 %


1.004912 = 1.06
or 6% increase in prices

December 184.9


Deflation is a fall in prices. Most observers would describe the current rate of change in prices as practically no inflation or, at least, such a low rate of inflation that it is not a serious problem. With inflation so low, it is not surprising to experience a negative rate of inflation (or deflation) in some months. October and November of 2003 were recent months were the CPI actually declined.

If prices were to fall on a continual basis, it is not as good news as one might initially think. If consumers expect prices to fall, many may put off purchases until prices are lower. This decrease in overall demand may contribute to further downward pressure on prices and to further reductions in spending. It is certainly possible, but not likely under current conditions, to experience such an event in the U.S.

How the CPI Data are Collected

"The Consumer Price Index (CPI) is a measure of the average change in prices over time of goods and services purchased by households. The CPI is based on prices of food, clothing, shelter, and fuels, transportation, fares, charges for doctors' and dentists' services, drugs, and other goods and services that people buy for day-to-day living.

“Prices are collected in 87 urban areas across the country from about 50,000 housing units and approximately 23,000 retail establishments - department stores, supermarkets, hospitals, filling stations, and other types of stores and service establishments. All taxes directly associated with the purchase and use of items are included in the index. Prices of fuels and a few other items are obtained every month in all 87 locations.

“Prices of most other commodities and services are collected every month in the three largest geographic areas and every other month in other areas. Prices of most goods and services are obtained by personal visits or telephone calls of the Bureau's trained representatives.” For more information on the Bureau of Labor Statistics, visit ( ).

The Consumer Price Index measures prices of goods and services in a market basket of goods and services that is intended to be representative of a typical consumer's purchases. Forty-one percent of the market basket is made up of goods that consumers purchase. The other fifty-nine percent includes services.

Costs of Inflation

Understanding the costs of inflation is not an easy task. There are a variety of myths about inflation. There are debates among economists about some of the more serious problems caused by inflation. A number of exercises in National Council on Economic Education publications, student workbooks, and textbooks should help students think about the consequences of inflation.

  1. High rates of inflation mean that people and business have to take steps to protect their financial assets from inflation. The resources and time used to do so could be used to produce goods and services of value. Those goods and services given up are a true cost of inflation.

  2. High rates of inflation discourage businesses planning and investment as inflation increases the difficulty of forecasting of prices and costs. As prices rise, people need more dollars to carry out their transactions. When more money is demanded, interest rates increase. Higher interest rates can cause investment spending to fall, as the cost of investing increases. The unpredictability associated with fluctuating interest rates makes customers less likely to sign long-term contracts as well.

  3. The adage “inflation hurts lenders and helps borrowers” only applies if inflation is not expected. For example, interest rates normally increase in response to anticipated inflation. As a result, the lenders receive higher interest payments, part of which is compensation for the decrease in the value of the money lent. Borrowers have to pay higher interest rates and lose any advantage they may have from repaying loans with money that is not worth as much as it was prior to the inflation.

  4. Inflation does reduce the purchasing power of money.

  5. Inflation does redistribute income. On average, individuals' incomes do increase as inflation increases. However, some peoples’ wages go up faster than inflation. Other wages are slower to adjust. People on fixed incomes such as pensions or whose salaries are slow to adjust are negatively affected by unexpected inflation.

Causes of Inflation

To understand causes of inflation, think of individual markets. What might cause prices to increase if we observe that prices are rising in most markets?

Increase in supply   Increase in demand   Decrease in supply   Decrease in demand

[The correct answers - Increases in demand will cause prices to rise. If demand is rising more rapidly than supply in most markets, most prices will be rising.

In addition, decreases in supply in most markets will cause most prices to rise. So if costs of manufacturing rises rapidly, prices in most markets will rise.]

Over short periods of time, inflation can be caused by increases in costs or increases in spending. Inflation resulting from an increase in aggregate demand or total spending is called demand-pull inflation. Increases in demand, particularly if production in the economy is near the full-employment level of real GDP, pull up prices. It is not just rising spending. If spending is increasing more rapidly than the capacity to produce, there will be upward pressure on prices.

Inflation can also be caused by increases in costs of major inputs used throughout the economy. This type of inflation is often described as cost-push inflation. Increases in costs push prices up. The most common recent examples are inflationary periods caused largely by increases in the price of oil. Or if employers and employees begin to expect inflation, costs and prices will begin to rise as a result.

Over longer periods of time, that is, over periods of many months or years, inflation is caused by growth in the supply of money that is above and beyond the growth in the demand for money.

Inflation, in the short run and when caused by changes in demand, has an inverse relationship with unemployment. If spending is rising more slowly than capacity to produce, unemployment will be rising and there will be little demand-pull inflation. If spending is rising faster than capacity, unemployment is likely to be falling and demand-pull inflation increasing.

That relationship disappears when inflation is primarily caused by increases in costs. Unemployment and inflation can then rise simultaneously.

Other Measures of Inflation

The GDP price index (sometimes referred to as the implicit price deflator). The GDP price index is an index of prices of all goods and services included in the gross domestic product. Thus the index is a measure that is broader than the consumer price index. The producer price index. This index measures prices at the wholesale or producer level. It can act as a leading indicator of inflation. If the prices producers are charging are increasing, it is likely that consumers will eventually be faced with higher prices for good they buy at retail stores.

Questions for Students

  1. What is inflation?

    [A continual increase in the average price level. The important points are that most prices or average prices rise and that the increase continues and is not just a one-time increase.]
  2. Calculate price indexes for the following a hypothetical secondary student’s budget.


    December, 2002






    $ 17



    $ 3



    $ 4

    New clothing

    1 complete set

    $ 50

    December, 2003



    $ 14



    $ 4



    $ 4.50

    New clothing

    1 complete set

    $ 60


    1. What is the price index for December, 2002 (with a base period of December, 2002)?

      [The price index for December, 2002 is equal to 100. The quantities for 2002 are multiplied by the 2002 prices. Then the quantities for 2002 are multiplied by the 2003 prices. To calculate the December, 2002 price index with a base period of that month, the 2002 quantities multiplied by the 2002 prices are divided by the 2002 quantities multiplied by the 2002 prices and then the result is multiplied by 100.]

    2. What is the price index for December, 2003 (with a base period of December, 2002)?

      [The price index for December, 2003 is equal to 109.7. To calculate the December, 2003 price index with a base period of December, 2002, the 2002 quantities multiplied by the 2003 prices are divided by the 2002 quantities multiplied by the 2002 prices and then the result is multiplied by 100.]

    3. What is the rate of inflation over the year?

      [The annual rate of inflation over the period is 9.7 percent. (The index for December 2003 minus the index for December 2003, given that the first index is the base year.)]

  3. Suppose the CPI was 150 for July of one year, and was 170 for July of the next year. What is the corresponding annual rate of inflation?

    [125. The price index is calculated by first taking the 2002 quantities times the 2002 prices. The 2003 prices are then multiplied by the 2002 quantities. Then the latter (the amount spent if only the prices change) is divided by the 2002 prices times 2002 quantities and multiplied by 100. ($25/$20) x 100 = 125. The most common mistake will be to calculate the second year with the 2003 prices and 2003 quantities.]

  4. The base year of the CPI is 1982-1984. What has happened to prices since 1970 if the 1970 index was approximately 80 and if the current CPI were 160?

    [A current level of 160 would mean that consumer prices on average are 100 percent higher than their 1970 levels. The percentage increase is (160 - 80) / 80 = 1 or 100 percent. The base year period is not relevant to the calculation.]

  5. If prices increase by five percent in a year, what effect does this have on the purchasing power of individuals in the economy?

    [Students may answer that purchasing power goes down since their money is worth less, and consequently they cannot buy as many goods and services. The value of money does fall. However, they are ignoring that inflation affects wages as well. If average incomes and prices of goods and services have increased by five percent, the purchasing power of average income remains unchanged.]