The FGV General Price Indexes were first released in November of 1947 in the first edition of Conjuntura Econômica magazine. Since then, price variations also have been compiled for agricultural and industrial raw material, intermediate products, and finished goods and services.
Three versions are available: the General Price Index-10 (IGP-10), the General Market Price Index (IGP-M), and the General Price Index-Internal Availability (IGP-DI). The difference between them is the time period in which information is collected for calculating the index (see chart). Prices collected during each period are compared to those prevailing 30 days before. IGP-DI is an index of the debts owed by states to the Federation, and IGP-M is used to correct, along with other parameters, electric power supply contracts.
Price Collection Periods
IGP – 10
IGP - M
IGP - DI
IGP-10, which has been issued since 1993, measures the price progression between the 11th day of the previous month and the 10th day of the reference month.. IGP-M is collected between the 21st day of the previous month and the 20th day of the reference month. Its series begins in 1989. IGP-DI is collected between the first and the last day of the reference month. The historical series goes back beyond 1944.
IGP-M differs from the other versions because it incorporates partial results of the index based on data collected in 10-day periods and released before the end of the month.
The first computation, released for the first 10-day period, calculates variations found in the information collected between the 21st and 30th days of the month before the reference month compared to variations found during the previous 30 days. The second computation extends the collection time frame to the period between the 21st day of the previous month and the 10th day of the reference month, presenting cumulative results. The third computation presents the full IGP-M.