Which retail strategy most directly exploits the scientific principle of the 'Endowment Effect' to increase sales conversion rates?

The intersection of neuroscience and retail strategy has revolutionized how products are marketed and sold. One fascinating psychological phenomenon retailers leverage is the 'Endowment Effect' - a cognitive bias where people assign higher value to items they own compared to identical items they don't possess. This poll tests your knowledge about how modern retailers scientifically apply this principle in their stores to influence purchasing decisions.

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Allowing customers to physically hold products before purchase, like test-driving cars or trying on clothes
Displaying limited quantity notifications ('Only 3 left!') next to popular items
Positioning high-margin items at eye level on store shelves
Using social proof through customer reviews and testimonials