EPSOM, U.K. - TelAve -- Most founders spend weeks debating how many pricing options to offer. New behavioural science suggests they are asking the wrong question.

When a founder builds a pricing page, the instinct is to optimise for clarity: fewer options, cleaner layout, less friction. The logic is sound. But it misses a more fundamental mechanism — one that operates not on the number of options presented, but on the relationship between them.

This is the domain of the Decoy Effect, and it may be the most underutilised lever in conversion rate optimisation.

The phenomenon was brought into mainstream behavioural science by Dan Ariely, demonstrating that introducing an asymmetrically dominated option — a choice that is clearly inferior to one alternative but not to another — alters how the brain evaluates the remaining options. The mechanism is comparative evaluation: the brain does not assess value in absolute terms. It assesses value relative to what is nearby. Place a poorly-valued middle tier next to a premium option, and the premium option no longer feels expensive. It feels like the obvious choice.

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When options are roughly equivalent, the brain struggles to resolve the comparison — a state of decision paralysis that typically ends in deferral. The decoy resolves this paralysis by creating an asymmetry. One option becomes clearly dominant. The comparative evaluation that was previously effortful becomes automatic.

The real-world evidence, however, demands nuance. A 2025 study found that dominated decoy options did increase consumers' likelihood of choosing the target option — but the effect size was modest, at roughly a 1% shift in preference. This is not a reason to dismiss the mechanism. It is a reason to deploy it with precision. A 1% shift across millions of transactions is commercially significant. Across a SaaS pricing page receiving thousands of monthly visitors, the same principle applies — but only when the decoy is correctly positioned, correctly priced, and correctly framed relative to the target tier.

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Marcello Pasqualucci, founder of Unbias Labs and a 15-year veteran of enterprise conversion rate optimisation, argues that most founders implement pricing tiers without any awareness of the comparative signals they are sending. "The decoy effect is not a trick," he says. "It is a description of how the brain actually works. When you understand that value is always perceived relatively — never absolutely — you stop designing pricing pages and start designing comparison architectures. That is a fundamentally different discipline."

Unbias Labs was built on precisely this premise. The Decoy Effect is one of more than fifty mechanisms the platform's diagnostic engine scans for — each one a documented pattern in human cognition, each one a potential source of silent revenue loss.

Founders who want to understand how cognitive bias is affecting their conversion funnel can explore the full bias database at https://www.getunbias.com/cognitive-biases