CPI (Consumer Price Index) is one of the data used by the government to measure inflation. Generally speaking, CPI is the percentage of commodity price increase in the market. Generally, market economy countries think that CPI is within the acceptable range of 2-3%, but of course it depends on other data. Personally, it is not a good thing that CPI is too high. High economic growth rate will raise CPI, but it is definitely not a good thing that the price index grows faster than the average income of the people, and the average wage is hard to exceed.

Calculation: 1. Select representative specifications. The current national method system defines the survey content as 25 1 basic classification and the minimum number of representative specifications contained under each basic classification. The representative specifications are determined by the provinces and cities themselves, and some specifications with local consumption characteristics can be appropriately added. According to the selection principle of representative specifications, our city has determined more than 600 specifications of goods and services as representative specifications for calculating the consumer price index. Once the representative specifications are determined, they shall not be replaced within one year. 2. Select the price survey point. Firstly, the sales of all kinds of commercial outlets are queued from high to low, and then equidistant sampling is carried out. It is necessary to comprehensively consider the factors such as large, medium and small stores, various economic types, comprehensive stores and professional stores, various commercial formats and reasonable layout, and make some corrections to the sampling results. Our city * * * selected nearly 300 commercial outlets as price survey points. Price survey points are adjusted once a year. 3. Calculate the weight of the consumer price index. Weight is an index that reflects the influence degree of the price change of the goods or services under investigation in the formation of the total index, and is calculated according to the proportion of household expenditure on various goods or services in the total expenditure. The weight data comes from the per capita consumption expenditure data in urban household survey statistics. The weight of the basic category and above is fixed for one year. 4. Price survey and calculation of average price. According to the correlation between goods or services and people's lives and the frequency of price changes, the number of price surveys is determined. Prices of fresh vegetables, fresh fruits, meat and eggs, aquatic products, etc. , survey once every 5 days; The prices of clothing commodities such as grain, oil, tobacco, alcohol, beverage and catering industry are investigated once every 10 day; The prices of goods or services fixed by the state and local governments are investigated once every 15 days. Price survey is a regular, fixed-point and personal direct survey. After collecting price data, the monthly average price should be calculated. That is, the simple arithmetic averages the time-point price of each representative specification of all survey points to get the monthly average price. For example, a clothing price is surveyed three times a month, and there are six survey points, that is, the price of 18 is added up and then divided by 18. 5. Calculate the consumer price index. After calculating the monthly average price, the monthly price index of different base periods can be calculated. Firstly, the price index of a single commodity or service item is calculated, and then the basic classified price index is calculated by geometric average of the single index, and then the class index and the total index are weighted by the basic classified index in turn.