Consumer Price Index (CPI)
National Statistics Institute
Definitions
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Monthly contributions:
The effect of a monthly variation rate of an article or aggregate in the overall index is defined as the part of the monthly variation of the overall index that corresponds to said article or aggregate. Therefore, the sum of the monthly effects of all of the articles in the shopping basket is equal to the monthly variation rate of the overall index. In other words, the effect that the monthly price variation of an article or aggregate has in the monthly variation of the overall index is the variation that this index would have experienced if all of the prices of the rest of the articles had remained stable that month.
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Accumulated contributions:
The effect of a monthly variation rate of an article or aggregate in the overall index is defined as the part of the monthly variation of the overall index that corresponds to said article or aggregate. Therefore, the sum of the monthly effects of all of the articles in the shopping basket is equal to the monthly variation rate of the overall index. In other words, the effect that the monthly price variation of an article or aggregate has in the monthly variation of the overall index is the variation that this index would have experienced if all of the prices of the rest of the articles had remained stable that month.
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Accumulated contributions:
The effect of the variation for the year-to-date (or accumulated variation) of an article or aggregate in the overall index, represents the accumulated variation that the overall index would experience if the rest of the articles were not to experience any price variation for the year-to-date. In other words, it is the part of the accumulated variation due to said article or aggregate.
