Consumer Price Index (CPI) is a measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food and medical care. It is calculated by taking price changes for each item in the predetermined basket of goods and averaging them. Changes in the CPI are used to assess price changes associated with the cost of living; the CPI is one of the most frequently used statistics for identifying periods of inflation or deflation.
The U.S. Bureau of Labor Statistics (BLS) reports the CPI on a monthly basis and has calculated it as far back as 1913. While it does measure the variation in price for retail goods and other items paid by consumers, it does not include things like savings and investments, and can often exclude spending by visitors from another country.
How CPI is Used
CPI is widely used as an economic indicator. It is the most widely used measure of inflation and, by proxy, of the effectiveness of the government’s economic policy. The CPI gives the government, businesses and citizens an idea about prices changes in the economy, and can act as a guide in order to make informed decisions about the economy.
The CPI and the components that make it up can also be used as a deflator for other economic factors, including retail sales, hourly/weekly earnings and the value of a consumer’s dollar to find its purchasing power. In this case, the dollar’s purchasing power declines when prices increase.
The index can also be used to adjust people’s eligibility levels for certain types of government assistance including Social Security and it automatically provides the cost-of-living wage adjustments to domestic workers. According to the BLS, the cost-of-living adjustments of more than 50 million people on Social Security, as well as military and Federal Civil Services retirees are linked to the CPI.
Who and What are Covered by the CPI?
The CPI statistics cover professionals, self-employed, poor, unemployed and retired people in the country. People not included in the report are non-metro or rural populations, farm families, armed forces, people serving in prison and those in mental hospitals.
The CPI represents the cost of a basket of goods and services across the country on a monthly basis. Those goods and services are broken into eight major groups:
– Food and beverages
– Medical care
– Education and communication
– Other goods and services
The BLS includes sales and excise taxes in the CPI — or those that are directly associated with the price of consumer goods and services — but excludes others that aren’t linked such as income and Social Security taxes. It also excludes investments (stocks, bonds, etc.), life insurance, real estate and other items that don’t relate to consumers’ day-to-day consumption.
Calculating Consumer Price Index
The BLS records about 80,000 items each month by calling or visiting retail stores, service establishments (such as cable providers, airlines, car and truck rental agencies), rental units and doctors’ offices across the country in order to get the best outlook for the CPI.
Types of Consumer Price Index
Two types of CPIs are reported each time. The CPI-W measures the Consumer Price Index for Urban Wage Earners and Clerical Workers. Between 1913 and 1977, the BLS focused on measuring this type of CPI. It was based on households whose incomes comprised of more than one-half from clerical or wage occupations, and in which at least one of the earners were employed for at least 37 weeks during the previous 12-month cycle. The CPI-W primarily reflects changes in the costs of benefits paid to those on Social Security. This measurement of CPI represents at least 28 percent of the country’s population.
The CPI-U is the Consumer Price Index for Urban Consumers. It accounts for 88 percent of the U.S. population and is the better representation of the general public. The BLS made improvements to CPI in 1978 and introduced a broader target population. This type of CPI is based on spending of almost all the population that resides in urban or metropolitan areas, and includes professionals, self-employed workers, those living below the poverty line, unemployed, and retired people. It also includes urban wage earners and clerical workers.
Despite introducing the CPI-U in 1978, the BLS continued to measure the traditional measure of the CPI-W. But since 1985, the two main difference between the two indexes has been the expenditure weights assigned to item categories and geographic areas.
Consumer Price Index Regional Data
The Bureau of Labor Statistics also breaks down the CPI based on regions. Each month, the report is broken out into the four major Census regions: Northeast, Midwest, South and West. Three major metro areas are also broken out each month. The regions are Chicago-Gary-Kenosha, Los Angeles-Riverside-Orange County and New York-Northern NJ-Long Island.
Along with the regional information provided each month, the Bureau of Labor Statistics also publishes reports for 11 additional metro areas every other month and an additional 13 metro areas semi-annually. These reports cover areas with large populations and represent a particular region subset.
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