Estimation of quantitative characteristics considering CPI microdata in Iran

The aim of this study is to estimate the known statistical characteristics of nominal price stickiness in the Iranian economy during the years 1390 to 1399 and at different commodity levels of microdata of consumer price index (including product category, Coicop commodity group, and the whole economy) and thus the stickiness between categories and product groups are also compared. For this purpose, 421 categories have been selected as a sample from the database of the Consumer Price Index Statistics Plan of the Statistics Center of Iran. This sample is about 93% of the number of consumer basket items in the base year 95 and 67% of consumer expenditures in the base year 90 covers. In this study, the nominal price stickiness index is estimated via the duration and frequency approaches. According to the results, this index is estimated at 29% based on frequency approaches in the whole economy and about 2.99 months based on the Duration approaches, which is less than in developed countries. Also, the comparison of indicators at the level of items and Coicop groups shows the existence of heterogeneity in the stickiness of nominal prices. The group of food and beverages and group of housing, water, electricity, gas, and other fuels have the lowest, and the group of communication and education have the highest price stickiness.