The specific reasons for the continuous increase in domestic pig prices are as follows: first, the number of live pigs has decreased, and the shortage of supply is the most important factor leading to the increase in pig prices; Second, corn and fish meal are the main feed raw materials for aquaculture, and their price increase is an important support for the price increase of live pigs; Third, the supply of piglets is in short supply, the price is rising, and the low enthusiasm of farmers has become another important factor supporting the price increase of live pigs; The manifestation of the law of value: the price fluctuates around the value under the influence of supply and demand. The manifestation of the law of value is also called the realization form and function form of the law of value. ② Equivalence exchange is an important principle of commodity exchange. "Equivalence" means that the value of goods exchanged by both parties should be equal, that is, the socially necessary labor time consumed by their respective goods is equal. After the emergence of money, the price of goods is measured by money, which is manifested as price. Equivalence exchange also requires that the price of goods should be consistent with the value, because the price is determined by the value. (3) In real life, prices and values are often inconsistent, which is caused by changes in supply and demand of commodities, which makes prices rise or fall; Conversely, the rise or fall of prices will also affect the relationship between supply and demand, so that supply and demand tend to be balanced, thus making prices close to value. (4) Due to the mutual restriction between price and supply and demand, the following situations will occur: First, the price will not go too far from the value, and it will always fluctuate around the value. Second: For a long time, from the perspective of the whole society, the average price of goods is consistent with its value. ⑤ The fluctuation of price around value shows that it has always been implemented as a trend and law that socially necessary labor time determines the content of value. Therefore, the expression of the law of value is not only not against the law, but also the expression of the law of value, and it is the only expression. The basic content and manifestation of the law of value are consistent, and the fluctuation of price around value is the external expression of the basic content of the law of value. The essence of the consistency between price and value can only be realized by the fluctuation of price around value in actual exchange. Price is ultimately determined by value.