Which psychological principle did James Dyson specifically leverage when designing his first bagless vacuum cleaner that helped overcome initial consumer resistance?

Many revolutionary products succeeded not just because of their technical merit, but due to deep understanding of consumer psychology. Inventors and product developers who mastered the art of anticipating human behavior often created the most influential products. This poll explores a fascinating case of how understanding consumer psychology led to a groundbreaking product development that changed an entire industry.

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The Ikea Effect - consumers value products more when they can see how they work
The Bandwagon Effect - creating artificial scarcity to increase perceived value
Loss Aversion - marketing the vacuum as preventing the loss of suction power
The Mere Exposure Effect - using extensive advertising to familiarize consumers with the new design