Purchasing and storage is the purchasing and storage mechanism of bulk commodities, which is common in agricultural products and non-ferrous metals.

When commodity prices fall, the state buys and stores in large quantities to prevent commodity prices from falling sharply;

In the case of rising commodity prices, throwing out stored commodities will curb the rise of commodity prices.

According to the different subjects of purchasing and storage, it is generally divided into two forms: national purchasing and storage and commercial purchasing and storage.