Which color-related retail innovation, discovered in the early 2000s, was found to increase online purchase completion rates by an average of 34% when implemented correctly?

In the world of retail, the science of color psychology has led to some groundbreaking discoveries that have transformed how brands connect with consumers. Throughout retail history, specific color innovations have dramatically altered consumer behavior and brand perception. This trivia question challenges your knowledge about a pivotal color-related discovery that revolutionized retail analytics and consumer psychology in the digital age.

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The 'Blue Trust Principle' - the discovery that specific blue hues in checkout pages significantly boost consumer trust and completion rates
The 'Green Gradient Effect' - the finding that green progress bars on multi-step purchases reduce abandonment by creating a sense of accomplishment
The 'Red Urgency Factor' - the discovery that limited-time offers in red increase purchase impulses by triggering scarcity responses
The 'Purple Loyalty Connection' - the finding that purple elements around membership benefits increase premium tier sign-ups by creating exclusivity associations