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In each of those years, about 7,000 families from around the country provided information each quarter on their spending habits in the interview survey.
To collect information on frequently purchased items, such as food and personal care products, another 7,000 families in each of these years kept diaries listing everything they bought during a 2-week period.
Consumer inflation for all urban consumers is measured by two indexes, namely, the Consumer Price Index for All Urban Consumers (CPI-U) and the Chained Consumer Price Index for All Urban Consumers (C-CPI-U).
( See the answer to Question 4 for an explanation of the differences between the CPI-U and C-CPI-U.) 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.
For example, in a given supermarket, the Bureau may choose a plastic bag of golden delicious apples, U. extra fancy grade, weighing 4.4 pounds to represent the category.If the selected item is no longer available, or if there have been changes in the quality or quantity (for example, eggs sold in packages of ten when they previously were sold by the dozen) of the good or service since the last time prices were collected, the economic assistant selects a new item or records the quality change in the current item.The recorded information is sent to the national office of BLS, where commodity specialists who have detailed knowledge about the particular goods or services priced review the data.Major groups and examples of categories in each are as follows: Also included within these major groups are various government-charged user fees, such as water and sewerage charges, auto registration fees, and vehicle tolls.In addition, the CPI includes taxes (such as sales and excise taxes) that are directly associated with the prices of specific goods and services.