The price depends on the relationship between supply and demand. When the supply exceeds the demand, the price will fall. When supply is less than demand, prices will rise.

First, vegetables are fresh, which has the characteristics of timeliness and short shelf life. The production is greatly affected by climatic conditions, so its output is also unstable.

Second, now the transportation is convenient and the information is timely. When the price of vegetables in a certain place rises too high, there will be vegetable wholesalers transporting vegetables across regions, which will have an impact on the local vegetable prices.

Third, affected by the epidemic, when an epidemic occurs in a certain place, it is difficult for vegetables from other places to enter, and the price will rise. There is also the mixed price increase of bad businesses.

Four, vegetables belong to the people's livelihood industry, by the government's macro-control.