The highly lucrative Chinese tea-drink market is experiencing brutal price competition, leading to involution.

China’s tea-drink market, with estimated annual sales of 370 billion yuan (US$54.2 billion), has become yet another example of involution as brutal price competition threatens to expel thousands of unprofitable small players. The dire scenario represents a rude reminder to those who hope to strike it rich by investing in a fast-growing business in mainland China’s vast consumer market, which abounds with boom-to-bust cycles. “Bubble tea is a dynamic market, and it is never easy to make money...