1. Income decrease: When personal income decreases, it may affect the consumption level. Faced with financial pressure, people may choose to reduce shopping expenses, reduce the quality of consumption, or find more affordable alternatives.

2. The price of daily necessities has risen: When people buy daily necessities, they find that the price is higher than before, and they may feel that their consumption has dropped. In this case, people may look for substitutes or reduce the number of purchases to deal with it.

3. Changes in shopping environment: When the shopping environment changes, such as the reduction of shopping malls and the closure of individual merchants, it may affect consumers' shopping experience. People may find that they can't buy the goods they like, thus feeling the degradation of consumption.

4. Changes in consumption concept: People's consumption concept will also affect consumption behavior. When people become more rational and pragmatic, and begin to pay attention to the cost performance of goods, instead of just pursuing brands and vanity, they may feel the degradation of consumption.

5. Changes in the socio-economic situation: When the socio-economic situation is not good, all walks of life may be affected, including the consumer market. During the period of economic growth slowdown or recession, people may feel the degradation of consumption.

In a word, consumption downgrade is a relatively complex concept, which may be affected by many factors. For individuals, consumption degradation may suddenly come at a certain moment, which is manifested in the decline of purchasing power and consumption quality. On the social level, consumption degradation may be a long-term trend, which is reflected in market demand and industrial structure.