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During the Warring States period, Lü Buwei, a wealthy merchant from the State of Wei, traveled to Handan, the capital of the State of Zhao, for business. There, he encountered Prince Yiren of Qin, who was held as a hostage.
Lü Buwei decided to undertake a political 'business venture' that would yield enormous profits with a small investment.
He first went to Qin to win over Lady Huayang's favor, persuading her to adopt Yiren as her son. This facilitated Yiren's return to Qin and his eventual ascension as the ruler, allowing Lü Buwei himself to become the Prime Minister of Qin.

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Open the tool →一本万利 (yī běn wàn lì) is a Chinese idiom (chengyu) meaning “to make a huge profit with a small capital”.
一本万利 is pronounced yī běn wàn lì in Mandarin Chinese.
Literally, 一本万利 means “one capital, ten thousand profits”. It is used to mean “to make a huge profit with a small capital”.
一本万利 comes from a classical Chinese story dating back to the modern era. The full story is on this page.
本钱小,利润大。