Who can deeply analyze the following CPI, the following statements about CPI are correct.

Answers]: a, b, c, d

The Consumer Consumption Index (CPI) is the relative number of consumer goods and service items purchased by urban and rural residents in a certain period of time, and is the result of a comprehensive summary calculation of the urban residents' consumption index and the rural residents' consumption index. The index can observe and analyze the impact of changes in retail sales of consumer goods and services on the actual cost of living of urban and rural residents, and is an economic indicator used to measure the level of inflation.

Answer]: c

The full name of CPI is the Household Consumption Index, which describes the index of changes in products and services related to residents' lives, and the Engel coefficient chain is the Engel coefficient that describes the "proportion of food expenditure in household income". Therefore, items a and d are incorrect. At present, the base period of China's CPI index is changed every five years, so it cannot be said in general terms that CPI data in different periods can be directly compared.

Therefore, item B is wrong. Buying a house is an investment behavior rather than a consumption behavior, so commercial housing** is not included in the CPI. Therefore item c is correct.

Answer]: During the ACPI index investigation, it is necessary to use a special CPI probe to check for gingival bleeding, dental calculus and periodontal pockets at the specified tooth position, divide the oral cavity into 6 sections, and check the gingival bleeding, tartar and periodontal pocket depth of 10 index teeth over 20 years old; For those under 20 years old and over 15 years old, 6 finger dust limbs and teeth should be examined; For those under 15 years old, 6 index teeth should be examined, and the depth of the periodontal pocket should be checked without cavity; There must be 2 or more functional teeth in each segment.

Answer]: BCPI index refers to the community periodontal index, suitable for large-scale epidemiological investigation of oral and land scales, including gingival bleeding, tartar, gingival sulcus or periodontal pocket depth, WHO stipulates that there must be 2 or more functional teeth in each section, and there is no indication for tooth extraction, the section is only examined, check the index teeth of each section, and those over 20 years old need to check the gingival bleeding, tartar, and periodontal pocket depth of 10 index teeth, so choose B. Poor.

Use CPI and PPI to appreciate, depreciate, and rise and fall currencies.

CPI is a lag in data, but it often isMarket economic activities and monetary policy is an important reference indicator。CPI stability, full employment, and GDP growth are often the most important socio-economic goals.

However, judging from the reality of China, the stability and importance of the CPI are not as "authoritative as developed countries believe, and the economic activity of the market will be adjusted according to changes in the CPI".

On January 11, 2021, the National Bureau of Statistics released data that in 2020, the national household consumption was **compared with the previous year**, and the price control goal of "the increase in household consumption **" was well achieved.

CPI, Consumer Price Index, reflects the price level of a country and region, appropriate prices contribute to the development of the economy, and for industries related to price statistics, you can filter out the objects that can be traded.