Among them, the principle of "equivalent exchange" is an important manifestation of the law of conservation of energy in the economic field, and even in the entire human society, that is, giving and receiving are required to be equal.Among them, the principle of "equivalent exchange" is an important manifestation of the law of conservation of energy in the economic field and even in the whole human society, that is, giving and receiving are required to be equal.Among them, the principle of "equivalent exchange" is an important manifestation of the law of conservation of energy in the economic field, and even in the whole human society, that is, pay and return are required to be equal.Among them, the principle of "equivalent exchange" is an important manifestation of the law of conservation of energy in the economic field, and even the whole human society, that is, pay and return are required to be equal.