What is the CPI? What is the chain ratio?

CPI (Consumer Price Index) is one of the data used by the government to measure inflation. In layman's terms, CPI is the percentage increase in the price of goods in the market. In general, market economies consider a CPI growth rate of 2% to 3% to be acceptable, but of course it depends on other data. a high CPI is never a good thing, high economic growth rate will pull up the CPI, but it is not a good thing to have a price index that grows faster than the average income of the people, and it is hard to see how the average wage can grow faster than 3-4%.

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Chain ratio: Comparison with the previous statistical period, for example, July 2005 compared with June 2005, called the chain ratio. Comparison with the same period in history, for example, July 2005 compared with July 2004, called the year-on-year. Ring growth rate = (the number of the current period - the number of the previous period) / the number of the previous period × 100% Reflects how much the current period than the previous period of growth; ring development rate, generally refers to is the ratio of the level of the reporting period and the level of the previous period, indicating that the phenomenon period by period of the speed of development. Ring ratio = (data of the current statistical cycle / data of the previous statistical cycle) × 100%

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