Open bidding is a traditional trading method in financial markets, originating in the 17th century, where trading information was conveyed through shouting and gestures. With the rise of electronic trading, this method has gradually been replaced, but the London Metal Exchange still retains its advantages, especially in complex transactions. Modern exchanges combine electronic technology with open bidding, reflecting a blend of face-to-face communication and technology. Although open bidding is no longer mainstream, its value in human judgment and market psychology still persists.