Demon: Open the Door to Free Trade

Chen Du is not dead! But as soon as he opened his eyes, he came to a rotten world. At the end of the dynasty, demons were rampant, practitioners were aloof, and ordinary people were like grass. He has no talent and no background. The most valuable thing on his body was a small glass bottle in his pocket. Fortunately, he also brought something else - a [Potential Balance Plate] of unknown origin. Cause and effect, destiny, memory, loyalty, power... They are all available, and they are all possible. From then on, he opened a door. This side of the door is a rotten world, and the other side of the door is a world of drunkenness and extravagance. Chen Du opened the door and shouted at everyone—— "Open the door, free trade!" [Potential balance board: The essence of the operation of the world is "exchange". Spiritual matter is exchanged from heaven and earth to the monk's body, information is exchanged from letters to the human brain, cause and effect is exchanged from behavior to result... All existence is in transaction. "What?" "Does the transaction still follow the principle of equivalence?" Chen Du was shocked, what does it mean if I forcefully trade a ball of air to replace your heart? Am I being kind? Normal transaction → forced transaction → lending business → transaction order...