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The world’s largest online shopping event, known as Single's Day, takes place every year on November 11. The brainchild of Alibaba co-founder Jack Ma, the event broke online sales records and raked in $25bn last year. Deborah Weitzmann explores how a Chinese celebration of the joys of NOT being in a relationship gave birth to a multi-billion dollar internet industry. (Image: Chinese workers sorting through parcels. Credit: Getty Images)