Introduction to high-five trading: The buyer inserts a drill pipe into the cheese, twists the cheese out by rotating it, tastes, smells, or pinches it with his hands to inspect and analyze the quality of the cheese, and then sets the price. The transaction method is based on the ancient high-five bidding method. Both parties continuously slap each other's palms and make counter-offers. Once the deal is completed, it's a high-five and there's no need to sign another contract.