Which psychological principle did Thomas Edison leverage when demonstrating his electric light bulb, fundamentally changing how inventors market their discoveries?

Throughout history, many groundbreaking inventions didn't succeed immediately due to consumer psychology barriers. Understanding how inventors and companies overcame these challenges reveals fascinating insights about human behavior and product adoption. This trivia question explores a significant psychological principle that revolutionized how new innovations are introduced to consumers.

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Social Proof - He installed lights on prominent streets where crowds would gather, making the technology seem widely accepted
Scarcity Effect - He limited initial production to create artificial demand and exclusivity for his invention
Anchoring Bias - He initially displayed impractical expensive versions to make commercial versions seem affordable
Mere Exposure Effect - He patented the design but delayed production until people became comfortable with the concept