Which psychological principle did Thomas Edison primarily use to market his electric light bulb, helping overcome public fear of electricity in the 1880s?

Throughout history, many groundbreaking inventions were marketed using specific psychological principles to gain consumer acceptance. This poll explores how inventors and companies leveraged consumer psychology to transform initially skeptical markets into enthusiastic adopters. Understanding the psychological strategies behind successful product launches reveals much about how revolutionary ideas become mainstream products.

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Social proof - by installing bulbs in visible public places like Morgan's bank and the New York Times to normalize the technology
Scarcity marketing - by limiting initial production to create artificial demand and exclusivity
Fear appeals - by advertising the dangers of gas lighting compared to the safety of electric light
Reciprocity - by offering free home installations to create a sense of obligation to purchase bulbs