Which innovative retail strategy did grocery chains widely adopt in the 1970s that fundamentally changed how food products compete for consumer attention?

In the competitive world of grocery retail, shelf placement can make or break a product's success. Over the decades, food manufacturers and retailers have developed sophisticated strategies for product positioning that influence consumer behavior in ways most shoppers never notice. This trivia question explores one of the most significant shifts in modern retail merchandising strategy that changed how products compete for your attention.

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Slotting fees (charging manufacturers for shelf space)
Eye-level product placement based on profit margins
Seasonal rotation of all shelf positions
Alphabetical organization of product categories