Pearl market cake, bǐozh shǐng, means exchanging pearls for cakes, which is a metaphor for putting an end to greed. From the story of He Yuan of Tang Dynasty.

suggestion

In the Tang Dynasty, He once went to see Wang Lao, a drug dealer, and asked him about Huang Baizhu's alchemy. He also specially gave him a big treasure bead as a gift. After the drug dealer Wang Lao got the orb, he asked someone to sell it and make bread for him. What a pity, Wang Lao, who sells medicine, replied, "How can you succeed if you are so stingy?"