Which groundbreaking retail innovation did Amazon introduce in 2005 that dramatically altered consumer expectations for online shopping and is now considered an industry standard?

Amazon has transformed the retail landscape dramatically over the past two decades, disrupting traditional retail models and forcing adaptation across the industry. Beyond just e-commerce, Amazon has pioneered numerous retail innovations that have become industry standards. This trivia question tests your knowledge about one of Amazon's most significant early retail innovations that changed consumer expectations forever.

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Amazon Prime membership with free two-day shipping
One-click purchasing patent
Customer product review system
Amazon Marketplace for third-party sellers