2. According to the degree of price increase, it can be divided into three levels: low inflation, high inflation and hyperinflation. Under normal circumstances, low inflation, also known as moderate inflation, is a normal economic phenomenon, while generally recognized hyperinflation is more than 50% per month, which often has a fatal blow to the economy. According to the source form of inflation, it is mainly divided into: inflation caused by excessive money, inflation caused by demand pull, and inflation caused by cost push. Among them, the inflation caused by excessive currency, that is, in a certain period of time, the growth rate of excessive currency is higher than the speed of social wealth creation, which leads to currency depreciation and general price increase.