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During the Han Dynasty, there was a man named Han Kang, who came from a wealthy family. However, he had no desire to become an official. Instead, he preferred to roam famous mountains, gather medicinal herbs, and sell them in the Chang'an market.
For thirty years, he consistently adhered to the principle of "口不二价" (quoting only one price), never haggling.
One day, a woman approached him to buy herbs and tried to bargain. She then remarked that she had long known Han Kang always stuck to his price.
Hearing this, Han Kang sighed, realizing that even by living in reclusion and hiding his identity, he was still recognized. Feeling his peaceful life was disturbed, he subsequently vanished into the seclusion of Ba Ling Mountain.

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Open the tool →口不二价 (kǒu bù èr jià) is a Chinese idiom (chengyu) meaning “to quote a fixed price”.
口不二价 is pronounced kǒu bù èr jià in Mandarin Chinese.
Literally, 口不二价 means “not quote two prices”. It is used to mean “to quote a fixed price”.
口不二价 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
指卖物者不说两种价钱。