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Often, a priori criteria will suggest how to classify different items to be displayed in a table or chart. This chart organizes categories of consumer expenditures in necessities and non-necessities, using standard definitions provided by the Bureau of Labor Statistics (see Duly, A. (2003). Consumer spending for necessities. Monthly Labor Review. 126(5): 3. http://stats.bls.gov/opub/mlr/2003/05/art1full.pdf). Sorting categories in descending order of dollar value within each of the major classifications of necessities and non-necessities promotes a logical description of the pattern within each of those conceptual groupings.