Which psychological principle explains why book series with consistent cover designs typically outsell those with varied designs, even when content quality is equal?

In the publishing industry, understanding consumer psychology is crucial for marketing books effectively. Publishers and authors who grasp why readers connect with certain stories can better position their work in the market. This poll explores an interesting aspect of consumer psychology in the literary marketplace that has influenced major publishing strategies in recent years.

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The Mere Exposure Effect - repeated exposure to a visual style increases preference
The Decoy Effect - consistent designs make individual books seem more valuable
The Scarcity Principle - uniform designs create perception of collection completeness
The Paradox of Choice - varied designs overwhelm consumers with too many visual options