Analiza harmoniczna w zastosowaniu do wyodrębnienia wahań cyklicznych wskaźnika cen towarów i usług konsumpcyjnych
Harmonic analysis applied to extract the cyclical fluctuations in the price index of consumer goods and services

Summary/Abstract: The article discusses the problem of cyclicality of the price index of goods and services (CPI), recognizing that it is worthwhile to conduct research to better understand this phenomenon, since the behavior of prices is crucial to the functioning of the economy. To determine the cyclical nature of the CPI the author uses harmonic analysis, which allowed him to determine the strength and length variations in this ratio. The study covers the period of 2003—2012. The CPI calculated ”month to the same month of the previous year” shows fairly stronger periodic fluctuations than the calculated ”month to previous month”.

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