The purchase amount of raw materials refers to the transaction amount of raw, perceptual and scattered raw materials collected by the author from real life, and the purchase price is higher than the current price. Buying quantity is the term of stock market and futures, which refers to the buying quantity of stocks and futures, that is, the current unsold demand for a certain stock and futures variety, and refers to active buying, that is, the buying price is higher than the current price, and the trading volume at this time is regarded as buying quantity. Material refers to raw, perceptual and scattered raw materials collected by the author from real life. Therefore, the purchase amount of raw materials refers to the raw, perceptual and scattered raw materials collected by the author from real life, and the transaction amount at this time is higher than the current price.