Customers compare products based on price and performance. According to economic theory, more options should lead to more rational decisions. However, purchase decisions follow different patterns: a third, strategically placed option can completely shift preferences between two alternatives without being chosen itself. The question is: How do additional options influence the perception of existing alternatives, what mechanisms control this comparison process, and what evidence exists for this phenomenon?
Studies
The Attraction Effect Experiment
Joel Huber, John Payne, and Christopher Puto conducted a series of experiments at Duke University in 1982 that systematically demonstrated the decoy effect for the first time. In one setup, 60 students chose between two beer brands: Beer A cost $1.80 with a quality rating of 70 points, while Beer B cost $2.60 with the same 70-point rating—a classic price-quality trade-off. Preferences split evenly at 50:50. The researchers then introduced a third option, Beer C, priced at $1.80 but with only 50 quality points. Suddenly, 68% chose Beer A, which now clearly dominated the inferior option. In a variation, they inserted a different decoy ($2.60, 50 points) that made Beer B appear superior. The result: 73% now chose Beer B. The remarkable finding: an option that nobody selects can shift preferences between two other options by over 40 percentage points.
The Economist Subscription Experiment
In 2008, Dan Ariely presented 100 MIT students with three subscription options for *The Economist*: Web-only for $59, Print-only for $125, and Print+Web for $125. The results were striking: 0% chose Print-only (the decoy), 16% chose Web-only, and 84% chose Print+Web. The Print-only decoy made the combo subscription appear irresistibly attractive. Ariely then repeated the experiment without the decoy—offering only Web-only ($59) versus Print+Web ($125). This time, 68% chose the cheaper Web-only subscription, and just 32% selected the combo. Removing an option that nobody wanted reduced preference for the expensive product from 84% to 32%—a 52 percentage point shift. Calculated revenue per customer dropped from $114.44 to $75.88.
Principle
Which principle for Customer Experience Design can be derived from this? Preferences emerge through comparison—whoever controls the comparison framework steers the decision. This principle is particularly valuable for designing product portfolios, pricing structures, and selection processes, as it enables companies to subtly guide customers toward a desired option without restricting their freedom of choice. The decoy effect works best for complex decisions involving multiple evaluable attributes, while proving less effective for very simple or purely price-based choices. It is also important that the decoy appears credible rather than obviously manipulative, as transparent manipulation can trigger reactance. The following guidelines demonstrate how to implement this principle in practice.
Guidelines
Design three price tiers with a decoy
Instead of presenting two options (budget versus premium), offer three tiers where the middle option acts as a decoy for the expensive one. The decoy should closely resemble the premium option but offer a noticeably inferior price-performance ratio. For example: Basic at €29, Professional at €79 (the decoy, offering only 20% more performance than Basic), and Enterprise at €99 (delivering double the performance of Basic). The decoy makes the Enterprise tier appear attractive without being selected itself.
Using Decoys in Product Configurators
# CX Guideline: Using Decoys in Product Configurators For configurators of complex products (cars, software, insurance), strategically incorporate decoy options. When customers are wavering between Engine A (150 HP, +€2,000) and Engine B (180 HP, +€4,000), introduce Engine C (160 HP, +€3,800). Option C is similar to B but clearly inferior—suddenly making B appear more attractive. Important: The decoy must seem natural, not like an obvious manipulation.
Design upgrade paths with decoy tiers
For SaaS products or memberships, strategically design your upgrade path. Rather than offering a direct jump from Free to Premium, insert an intermediate tier to serve as a decoy. For example: Free (€0), Plus (€9 with minimal additional features), and Pro (€15 with significantly more features). The Plus tier acts as the decoy—making Pro appear more attractive to users ready to upgrade. Measure effectiveness by comparing the Free→Pro conversion rate with and without the Plus tier in place.
Optimize comparison tables for dominance
In pricing tables, visually highlight the target option (e.g., "Most Popular" label, colored border) AND include a decoy option. Display attributes where the target option excels and the decoy appears weaker. For example, if the target offers "Unlimited Storage," show "500 GB" for the decoy—not "450 GB," which is too similar. The target's superiority must be immediately apparent at a glance.
Using Decoy Options
Add a strategic decoy option that makes another choice appear clearly superior—typically by offering similar pricing with significantly fewer features. The decoy itself will rarely be selected, but it makes the target option an obvious choice. The following examples illustrate this guideline:
- The Economist: Print: $125 | Digital: $59 | Print + Digital: $125. No one chooses 'print only' at the same price as the combo. The decoy doubled sales of Print+Digital.
- Kino-Popcorn: Small: €3 | Medium: €6.50 | Large: €7. 50 cents more for twice as much? The medium is the decoy that makes large a no-brainer.
Huber, Payne und Puto (1982). Studenten. None