Plateau and sales volume

"I wonder how business will be today," Chu Xian thought to himself as he stood by the shop door expectantly.

"Hello! Welcome!" Chu Xian greeted the passerby enthusiastically. The first customer came pretty quickly.

To his astonishment, the customer was a familiar face.

"Heh. Hello, it's nice to see you, Chu Xian," He Wei greeted, walking up to Chu Xian with a slightly sheepish smile. "Congratulations! You're running such a high-class goldfish store now. I was petty and small before; I hope you can forgive me." (1)

"Haha," Chu Xian chuckled, looking at He Wei with some surprise. He shook his head and said, "Don't worry about it. I've already forgotten what happened."

"Okay, that's great!" He Wei said happily. "I saw on WeChat that the goldfish you're selling are very beautiful, so I came to buy a couple."

"Sure. You can look for any goldfish you like, or I can pick some out for you!" Chu Xian said with a smile.