Can the Decoy Effect Change What Consumers Buy?

Consumers rarely make purchase decisions in isolation. A product may seem expensive until it is placed next to a more expensive alternative, or a particular subscription may suddenly look like better value when another option offers slightly less for almost the same price. The choice itself has not changed, but the way consumers evaluate it has.

This is where the Decoy Effect comes into play. It describes a situation in which introducing a third, strategically positioned option changes the preference between two existing choices. Rather than simply judging each product on its own merits, consumers compare the options within the choice set, and that comparison can influence what they eventually buy. Research on the effect dates back to experiments in the early 1980s and has since been examined across different purchasing contexts.

How the Decoy Effect Influences Consumer Choice

Imagine a coffee shop offering two cup sizes. A small costs ₹150, while a large costs ₹250. For some customers, the decision may depend on how much coffee they actually want. Now imagine the shop introduces a medium for ₹230. Suddenly, the large cup can appear more attractive because it offers more for only ₹20 extra. The medium has become a point of comparison, even if relatively few customers actually choose it.

That is the basic logic behind the Decoy Effect. The third option, known as the decoy, is designed to be less attractive than one of the original options while remaining comparable on important attributes such as price and quality. This makes the preferred option appear stronger by comparison. Academic research describes this as an asymmetrically dominated decoy, where the target option performs better than the decoy across the relevant trade-off.

The effect is closely connected to the way people evaluate trade-offs. When consumers are choosing between two products with different advantages, the decision may not be obvious. Adding a third option can provide a reference point that makes one of those trade-offs feel easier to justify. In other words, consumers are not necessarily discovering that the product itself has become better. Its position within the choice set has changed.

This has obvious implications for pricing and product architecture. Businesses often present multiple plans, packages or versions of a product, and the relationship between those options can influence how customers perceive value. A strategically positioned middle or premium option, for instance, can make another offering seem more reasonable.

However, the Decoy Effect is not a guarantee that consumers will choose the intended product. Context matters, and research has also explored circumstances in which the effect can be weakened or reversed. A 2025 study published in Japanese Psychological Research found that promotional strategies such as buy-one-get-one-free offers and bonus packs could counteract a decoy effect in experimental online purchasing situations. The study involved 216 participants across its formal experiments.

Also read: Why Does Brand Contrast Matter When Every Competitor Looks Similar?

The same research also highlights why online shopping can provide fertile ground for these effects. Consumers regularly encounter large numbers of products and often rely on comparisons to make sense of their options. When there is uncertainty about quality or value, the structure of the choice set can become particularly important.

For marketers, the lesson is less about simply adding a third product and more about understanding how consumers compare alternatives. Pricing, features, quantities, and perceived value all contribute to the way an offer is evaluated. A decoy can change that comparison, but its impact depends on how the options relate to one another and on what the consumer actually values.

Ultimately, the Decoy Effect shows that consumer choice is shaped not only by what brands offer, but also by how those offers are presented alongside one another. Sometimes, changing the surrounding choices can change how attractive a product feels without changing the product itself. For marketers, that makes choice architecture an important part of the buying experience.

– Written by Saad Rashid, an experienced journalist with extensive experience across both print and digital media. He has worked with various publications in India and internationally and has reached millions of readers through his thought-provoking articles.

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