Which retail psychology technique is proven to increase sales of premium food products by placing them at specific locations in grocery stores?

In the competitive food retail industry, understanding consumer behavior can make or break a brand's success. Supermarkets and food companies invest millions in researching how to influence our purchasing decisions. From store layouts to packaging colors, nothing is left to chance. This trivia question explores one of the most effective yet subtle techniques used by food retailers to boost sales. Can you identify the correct psychological strategy among these options?

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The Parallax Principle - placing premium items at the exact center of shelves to create an optical focus point
The Eye-Level Effect - positioning high-margin products at eye level because shoppers are more likely to choose items they can see without looking up or down
The Primacy Strategy - arranging luxury food items at the beginning of each aisle to establish quality expectations for the entire section
The Color Contrast Method - surrounding premium products with items in complementary colors to make them visually 'pop' to shoppers