Which psychological principle did inventor Sylvan Goldman specifically target when he invented the shopping cart in 1937, revolutionizing retail behavior?

Throughout history, many revolutionary inventions have been driven not just by technological innovation, but by deep understanding of consumer psychology. Inventors who could anticipate human needs and behaviors often created the most impactful products. This poll explores how consumer psychology influenced a famous invention that changed shopping behavior worldwide. Test your knowledge about the psychological principles behind this retail revolution!

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The IKEA Effect - making customers feel they've 'built' their shopping experience
The Paradox of Choice - limiting decisions to prevent shopping fatigue
Unit Bias - encouraging customers to purchase a 'normal' amount rather than just what they can carry
The Endowment Effect - making shoppers feel ownership of products before purchase