Which traditional Chinese concept was the inspiration behind Singles' Day (November 11 or 11.11), now the world's largest shopping festival?

Shopping festivals have become major cultural events worldwide, blending commerce with tradition. These events often originate from cultural celebrations but evolve into economic powerhouses that drive retail innovation. Test your knowledge about the world's largest shopping festival and its cultural roots. This question explores how traditional values have transformed into modern commercial phenomena while maintaining cultural significance.

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Bàchelor (光棍) - A celebration of proud single living that began as an anti-Valentine's Day in the 1990s at Chinese universities
Dōuzhī (豆知) - An ancient harvest festival where merchants traditionally offered special deals to celebrate agricultural abundance
Hónglì (红利) - A Confucian tradition of offering gifts to loved ones on the 11th day of the 11th month for good fortune
Jìnmài (进脉) - The Chinese tradition of renewing business connections at year's end with ceremonial purchases