無本生利 [无－－－]

Jyutping mou4 bun2 sang1 lei6
Pinyin wú běn shēng lì

Definitions (粵典–words.hk)
  1. 語句
    唔​需​成本​或​成本​好​低​就​可以​賺​到​錢​嘅​生意
    to be able to make a profit without cost
Definitions (Wiktionary)
  1. phrase, idiomatic
    to make a profit without having to invest capital beforehand