What was the original purpose of Amazon's first Prime Day in 2015?

Amazon's Prime Day has become one of the biggest shopping events in retail history, generating billions in sales and transforming summer retail calendars globally. But behind this massive commercial success lies an interesting origin story that many business professionals might not know. Test your knowledge about how this retail phenomenon came to be and its impact on the e-commerce landscape.

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To celebrate Amazon's 20th anniversary and boost Prime membership sign-ups during a traditionally slow retail period
To compete directly with Alibaba's Singles Day and establish dominance in the Asian e-commerce market
To clear excess inventory after a disappointing Q1 earnings report worried investors
To test AWS server capacity for handling holiday-level traffic before implementing Black Friday infrastructure upgrades