"Inflation rate refers to the rate at which the purchasing power of money declines. It is usually expressed in the form of a percentage and is an important indicator in economics. The inflation rate is calculated by comparing the rate of change of the price index with the underlying price index for a certain period of time. Divide and multiply by 100. For example, if the underlying price index is 100 and the price index one year later is 110, the inflation rate is 10%.

The level of inflation has a profound impact on the economy. When the inflation rate is too high, the purchasing power of money will drop too fast, and people's willingness to consume will decline, leading to an economic recession. At the same time, the production cost of enterprises will rise, leading to a further rise in commodity prices, forming hyperinflation. Therefore, it is very important to keep the inflation rate within a certain range.

Different countries and regions have different settings for the target of inflation rate. For example, the U.S. Federal Reserve's goal is to keep inflation at around 2%. China's goal is to control inflation at around 3%.

The impact of the inflation rate is not limited to the economic field, but also has an impact on social life. For example, an increase in inflation will lead to an increase in the cost of living and a decrease in people's quality of life. Therefore, the government and the central bank need to take measures to control the inflation rate and maintain economic and social stability. Common measures to control inflation include raising interest rates, reducing government spending, and tightening monetary policy. "