Which religious shopping festival generates the highest retail sales globally each year?

Throughout history, religious traditions have influenced retail practices and shopping festivals worldwide. Many major shopping events have roots in religious observances, while faith-based retailers have created unique retail ecosystems. This trivia question explores the intersection of commerce, retail traditions, and religious observances that shape consumer behavior during significant faith-based celebrations.

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Christmas shopping season (Christian)
Diwali shopping festival (Hindu)
Ramadan/Eid shopping period (Islamic)
Chinese New Year shopping season (Confucian/Buddhist/Taoist)