IPCA-15 is a consumer price index produced by Instituto Brasileiro de Geografia e Estatistica (IBGE), in Rio de Janeiro. The data collection period ranges from approximately the 15th of the previous month to the 15th of the current month, using the previous 30 days as its period of reference. The base period is December 1993=100. The index reflects consumption by families whose incomes range from the national minimum wage to 40 times minimum wage (for minimum wage see, BZMW Index <Go>). IPCA-15 is for the following urban areas: Rio de Janeiro, Porto Alegre, Belo Horizonte, Recife, Sao Paulo, Belem, Fortaleza, Salvador, the federal district of Brasilia, Curitiba and Goiania. IPCA-15 is composed of following categories and weights: food (20.5%), housing (13.6%), household items (4.7%), clothing (6.6%), transportation (20.8%), healthcare (10.8%), personal items (9.5%), education (7%) and communication (6.4%). For this index, IBGE considers only M1 purchases and weights the sample basket according to region and income.