According to the law of value, the price fluctuates around the value, which is influenced by the relationship between supply and demand and also by the national macro-control. 60% farmers in China, most of whom grow food products, are no longer in short supply, which leads to an oversupply of food, a drop in food prices and low farmers' income. Therefore, some farmers began to plant other agricultural products and began to March into high-end products, so that the grain output no longer increased blindly. In order to prevent the gap between urban and rural areas from being too large, the government adjusted the price of grain and raised the price of agricultural products.