This lesson focuses on the Consumer Price Index (CPI) and rate of inflation reported October 19, 2011, by the U.S. Bureau of Labor Statistics (BLS) for the month of September, 2011. Students read the BLS report, analyze the meaning of the CPI data, determine the change in consumer prices, and explore the impact of the change in the price level on themselves, their families, consumers, and producers.


Business Cycles, Consumer Price Index (CPI), Inflation, Macroeconomic Indicators, Price Stability


  • Identify the level and rate of change in the consumer price index and rate of inflation in the United States in September, 2011.
  • Identify factors that have influenced recent changes in the price level.
  • Describe how inflation impacts different groups in the economy.
  • Distinguish between the CPI-U, core rate and other measures of inflation.

Current Key Economic Indicators

as of November 30, -0001


Each month, the U.S. Bureau of Labor Statistics (BLS) releases an estimate of the level of the consumer price index (CPI) and the rate of inflation in the United States for the previous month. The report provides the most recent current and seasonally adjusted consumer price indexes for all urban consumers, urban wager earners, and the chained index, plus a breakdown by major expenditure groups. The BLS also collects price level data for major metropolitan areas and regions.

This lesson focuses on the October 19, 2011, BLS press release of data on the consumer price index for the month of September, 2011.

For the latest updates on U.S. economic indicators, go to:

[Note: You can subscribe to receive monthly BLS email news releases. To subscribe, go to the BLS News Service Subscription Page .]

[Note on the CPI and Inflation "Focus on Economic Data" LessonsDuring the first semester of this school year (September-December, 2011), EconEdLink will publish four lessons on "Consumer Price Index and Inflation." During this time period, the Focus on Economic Data will begin with the "basics" in September and progressively focus on more complex data, issues, and comparisons. All monthly lessons will include the current data and significant recent changes.

  • September: CPI and inflation (deflation) basics: What is the CPI? What is inflation and deflation? How are they measured? What do they mean?
  • October: More details and issues about the measurements and meaning of the measurements of the price level, adding additional concepts.
  • November: U.S. regional and global price level and inflation comparisons.
  • December: The relationships of CPI and inflation data to other economic data, such as GDP, employment. etc. and the business cycle. End of year price level summary and potential issues.]


Key Economic Indicators

as of October 19, 2011


On a seasonally adjusted basis, the CPI-U increased 0.3 percent in September after increasing 0.4 percent in August. The index for all items less food and energy rose 0.1 percent in September after increasing 0.2 percent in August.

Employment and Unemployment

Nonfarm payroll employment edged up by 103,000 in September, and the unemployment rate held at 9.1 percent. The increase in employment partially reflected the return to payrolls of about 45,000 telecommunications workers who had been on strike in August.

Real GDP

Real gross domestic product -- the output of goods and services produced by labor and property located in the United States -- increased at an annual rate of 1.3 percent in the second quarter of 2011, (that is, from the first quarter to the second quarter), according to the "third" estimate released by the Bureau of Economic Analysis. In the first quarter, real GDP increased 0.4 percent.

Federal Reserve

The FOMC decided to keep the target range for the federal funds rate at 0 to 1/4 percent and currently anticipates that economic conditions--including low rates of resource utilization and a subdued outlook for inflation over the medium run--are likely to warrant exceptionally low levels for the federal funds rate at least through mid-2013. The FOMC also decided to purchase up to $400 billion of long-term securities and sell short-term securities in order to "put downward pressure on longer-term interest rates and help make broader financial conditions more accommodative."


According to the web site “” the U.S. economy has experienced an average annual rate of inflation of 3.24 percent since 1913, as measured by the consumer price index. That means, on average, a good or service that cost $1 in 1913 cost about $22.92 in 2011 – a compound inflation of 2191.8 percent. [Source: uses BLS CPI-U data.]

[Teacher Note: To illustrate a "trend line" hold a strait edge across the graph (Figure 1) so that it generally follows the averages over time.  In this case, the trend line will may not be at approximately 3.24, because the time period is a shorter period than the 1913-2001 average.]

On October 19, 2011, the BLS announced: "The Consumer Price Index for All Urban Consumers (CPI-U) increased 0.3 percent in September on a seasonally adjusted basis... Over the last 12 months, the all items index increased 3.9 percent before seasonal adjustment. "

U.S. inflation during the past year has been just slightly higher than the annual average for the past 98 years.  This happened during an extended economic slowdown following the most severe recession since the Great Depression of the 1930s.  Is inflation a sign of recovery?

[Teacher Note: Ask your students: Does an inflation rate of 3.9 percent over a year seem bad?  Have you noticed price increases in the past year? It might be interesting for the students to guess which product prices have increased and which have decreased in the past year.  See the CPI data by product: ]

Figure 1, below, shows the monthly rates of change in the CPI-U since 2002.  Note the periodic ups and downs, and a trend line over time of just over 3 percent.

figure 1

Figure 2, below, shows the average rates of inflation (CPI-U) for each decade since 1913.  Again, note the ups and downs over time, and an average of just over 3 percent since 1913.

Figure 2: CPI
U.S. Average Annual Inflation Rate by Decade
1913-1919** 9.80%
1920-1929 -0.90%
1930-1939 -2.08%  Includes the Great Depression
1940-1949 5.52%
1950-1959 2.04%
1960-1969 2.32%
1970-1979 7.06%  Periods of "stagflation"
1980-1989 5.51%
1990-1999 3.00%
2000-2009 2.56%
2010-1011 1.83% The most full-year data
1913-2011 3.24%  Average over the last 98 years
* Source:
** The U.S. began tracking consumer price data in 1913


To better understand the recent changes in the U.S. price level, take a look at the most recent BLS consumer price index announcement. 

U.S. Bureau of Labor Statistics: Consumer Price Index - September 2011

Released October 19, 2011

"The Consumer Price Index for All Urban Consumers (CPI-U) increased 0.3 percent in September on a seasonally adjusted basis, the U.S. Bureau of Labor Statistics reported today. Over the last 12 months, the all items index increased 3.9 percent before seasonal adjustment."

Recently, the BLS has focused attention on energy and food prices in its monthly CPI-U announcements.  Energy and food prices tend to be more volatile than other prices.  The CPI-U less food and energy is the "core" CPI.

The Impact of Food and Energy Prices

“Increases in energy and food indexes were the main cause of the seasonally adjusted all items increase. The gasoline index continued to rise, and indexes for electricity and natural gas increased as well. Broad increases in food indexes also continued in September, with the food at home index rising 0.6 percent for the third month in a row and no major grocery store food group indexes declining.”

The "Core" CPI-U in September

“The index for all items less food and energy increased 0.1 percent in September, its smallest increase since March. The index for apparel declined in September after a series of sharp increases, and the indexes for used cars and recreation turned down as well. The indexes for new vehicles and household furnishings and operations were both flat. The shelter index rose, but posted its smallest increase since April, while the indexes for medical care, airline fares, and tobacco all increased.”

For the details of the September 2011 CPI-U data, including comments on the effect of energy and food prices, see the BLS announcement,

12-Month Price Level Change

“The 12-month change in the all items index, which was 3.8 percent in August, edged up to 3.9 percent in September. The 12-month change for all items less food and energy remained at 2.0 percent for the second straight month. The energy index has risen 19.3 percent over the last year, while the food index has increased 4.7 percent.”

[Note to teachers:  For more information about the "core" rate of inflation, see the BLS Frequently Asked Questions" page .  Students can discuss the pros and cons of the reported CPI-U and the "core" rate as reliable measures of inflation.]

[Note to teachers: Have your students noticed changes in food prices - either in grocery stores or restaurants?  It may be interesting to look at the history of prices in this category.  See Table 2 .]

[Note to teachers: In November, 2007, the BLS published an interesting report on Thanksgiving Food Prices - at home and away from home .  The report also mentions other Thanksgiving Day activities, such as time spent watching football games.]

Take a look at the prices level changes in September for the major spending categories.  Figure 3, below, shows the "Percent Change in the CPI, All Urban Consumers, U.S. City Average, September, 2011."  Note the spending categories that increased and decreased in September.


Figure 3:  Changes in CPI All Urban Consumers
U.S. City Average, September 2011
(Seasonally adjusted)



12 months
Sept.- Sept.

All Items






     Food at home



     Food away from home






     Energy commodities






     Fuel oil

 - 0.7


     Energy services






All items less food and energy



     New vehicles



     Used cars and trucks

 - 0.6



 - 1.1





     Transportation services



     Medical care services



Consumer Price Index for All Urban Consumers (CPI-U)

The all urban consumer group represents about 87 percent of the total U.S. population. It is based on the expenditures of almost all residents of urban or metropolitan areas, including professionals, the self-employed, the poor, the unemployed, and retired people, as well as urban wage earners and clerical workers. The CPI for All Urban Consumers (CPI-U) is the index most often reported by the national media.

The Level of the CPI-U

"The Consumer Price Index for All Urban Consumers (CPI-U) increased 3.9 percent over the last 12 months to an index level of 226.889 (1982-84=100). For the month, the index increased 0.2 percent prior to seasonal adjustment."

The market basket of goods and services that cost an urban consumer $218.44 in September, 2010, cost $226.90 in September, 2011. Is a rise of $8.46 in a year  significant?  Remember, this CPI-U data is based on a base period of 1982-84.  That same market basket cost just $100 in 1982-84.  Take a look at the history of the level of the CPI-U at this BLS webpage:

Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W)

The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) is based on the expenditures of households included in the CPI-U definition that also meet two requirements: more than one-half of the household's income must come from clerical or wage occupations, and at least one of the household's earners must have been employed for at least 37 weeks during the previous 12 months. The CPI-W population represents about 32 percent of the total U.S. population and is a subset, or part, of the CPI-U population. The CPI for Urban Wage Earners and Clerical Workers (CPI-W) is the index most often used for wage escalation agreements.

The BLS reported the CPI-W for September as: "The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) increased 4.4 percent over the last 12 months to an index level of 223.688 (1982-84=100). For the month, the index increased 0.2 percent prior to seasonal adjustment."

Prices for "wage earners and clerical workers" rose slightly more in September than prices for all urban consumers.  

Consumer price indexes often are used to escalate or adjust payments for rents, wages, alimony, child support and other obligations that may be affected by changes in the cost of living. The BLS has published a fact sheet explaining how to use the CPI for escalating (negotiating) employment contracts.

The CPI may not be an appropriate measure of inflation for all population groups. For example, the CPI-U is designed to measure inflation for the U.S. urban population and thus may not accurately reflect the experience of people living in rural areas. Also, the CPI does not produce official estimates for the rate of inflation experienced by subgroups of the population, such as the elderly or the poor.

The CPI, Inflation and the Cost of Living

A BLS online publication, "Frequently Asked Questions: Is the CPI a Cost-of-Living Index? ," explains the relationship of the CPI to inflation and the cost of living.

"The CPI is the most widely used measure of inflation and is sometimes viewed as an indicator of the effectiveness of government economic policy. It provides information about price changes in the Nation's economy to government, business, labor, and private citizens and is used by them as a guide to making economic decisions. In addition, the President, Congress, and the Federal Reserve Board use trends in the CPI to aid in formulating fiscal and monetary policies."

"The CPI frequently is called a cost-of-living index, but it differs in important ways from a complete cost-of-living measure. BLS has for some time used a cost-of-living framework in making practical decisions about questions that arise in constructing the CPI. A cost-of-living index is a conceptual measurement goal, however, and not a straightforward alternative to the CPI. A cost-of-living index would measure changes over time in the amount that consumers need to spend to reach a certain utility level or standard of living."

"Both the CPI and a cost-of-living index would reflect changes in the prices of goods and services, such as food and clothing, that are directly purchased in the marketplace; but a complete cost-of-living index would go beyond this role to also take into account changes in other governmental or environmental factors that affect consumers' well-being. It is very difficult to determine the proper treatment of public goods, such as safety and education, and other broad concerns, such as health, water quality, and crime, that would constitute a complete cost-of-living framework."

Extra attention is given by forecasters to the core index as it tends to show more lasting trends in prices. The rates of change in the core index were higher in the early part of the year and that did cause concern about the trend in inflation. The concern was that the increase in energy prices over the last several years may have started to influence rates of increases in all other prices. While that concern still exists, core prices are increasing at relatively slower rates.

The "headline" rate - the rate most often reported in the media includes energy and food. Adding the more volatile energy and food prices often shows greater rates of change. In some cases, a drop in energy prices added to inflation in other categories will end up showing a net "no change."

[Note to teachers:   Ask your students which of the two, the headline rate or the core rate, is the more meaningful measure of inflation.]

Calculating the Rate of Inflation Over a Period of Time

The CPI Inflation Calculator allows customers to calculate the value of current dollars in an earlier period, or to calculate the current value of dollar amounts from years ago. The CPI inflation calculator uses the average Consumer Price Index for a given calendar year. This data represents changes in prices of all goods and services purchased for consumption by urban households. This index value has been calculated every year since 1913. For the current year, the latest monthly index value is used.

[Teacher Note: Students can select a time period and determine the rate of inflation over that period.  They can also research to find events or forces that impacted the price level during that period.]

The BLS has published an online reading, "The Consumer Price Index —Why the Published Averages Don't Always Match An Individual's Inflation Experience ." This may answer some of your questions about your experiences with price level changes.

Looking Back in CPI History

win picture

In 1973 and 1974, the United States was experiencing inflation averaging about one percent per month. U.S. consumers lost over 10 percent of their purchasing power in just one year. On October 8, 1974, President Gerald R. Ford, in a speech to Congress, announced the “Whip Inflation Now” program.

President Ford proposed a variety of grass-roots strategies to reduce the impact of inflation. He encouraged people to increase their savings and reduce spending, along public measures, such as higher taxes and reduced government spending. He encouraged  people to join the effort by wearing "WIN" buttons. Though the rate of inflation slowed somewhat for a couple of years, it reached even higher levels in 1979 and 1980.

[Note to Teachers: Your students may not remember a time in their lives when prices were significantly increasing (except maybe the price of gasoline).  Ask them how they think they would react to higher prices for the things they buy?  They may want to think about how they would respond. 

The October 21, 2011, New York Times reported that McDonalds has raised its hamburger prices twice over the past year (1 percent in March and another 1.4 percent in May) and may raise prices again soon to offset high beef prices. Have your students noticed?]


Short Answer Question

1. How does inflation impact your life?

[Answers will vary. Students should be able to connect their spending patterns to price level changes. One common comment should be about gasoline prices over the past year. Students may also commonly comment on changes in the prices of apparel and entertainment. They should use the terminology of the CPI (as found in this lesson) accurately.]

2. What is the "core" rate of inflation?

[The core rate of inflation is the CPI-U for all items, less energy and food prices.]


Once again, the U.S. economy has experienced an average annual rate of inflation of 3.24 percent since 1913.  A good or service that cost $1 in 1913 cost about $22.92 in 2011.Though the annual average inflation is 3.24 percent, the inflation rate has ranged from a high inflation rate of 20.0 percent in 1918 to a low rate of -10.8 percent (deflation) in 2921.  Over the past 20 years, the high has been an increase of 4.2 percent in 1991 and a low rate of minus 0.4 percent (deflation) in 2009.

Overall, U.S. prices have been relatively stable in recent times, with energy prices largely determining the annual trends.  The price of gasoline has ranged from a ten-year low of $1.20 per gallon in December, 2001, to a high of $4.14 in July, 2008.

Keep an eye on energy prices as you look for signs of future inflation.


The BLS provides more detailed information about how price level changes are measured for different demographic groups, sectors, and specific product groups.

One resource that may be of interest to students is the BLS online publication, "How BLS Measures Price Change for College Tuition and Fees in the Consumer Price Index."

Take a look at the reading. Link:

How might the prospect of inflation impact your post-high school plans - working or more education?