Decision & ChoiceBias #19

Decoy Effect

A third option can steer a choice.

The phenomenon where consumers change their preference between two options when presented with a third, less attractive option (the decoy).

Why it matters: Widely used in pricing strategies, especially subscription tiers and product line-ups.

Watch for

Feeling pushed toward a choice that is only relatively better, not truly better for your needs.

Try this

Compare each option against your real need, not just the surrounding menu.

Real-world example

A small coffee for £2, a medium for £3.50, and a large for £3.60 — the large looks like the best deal next to the barely-cheaper medium.

Key researchers

Joel Huber, John Payne, Christopher Puto

First described in 1982

Psychological mechanism

Local Context Comparison. The human brain struggles to assign absolute utility to standalone items; we are heavily dependent on comparison. Introducing an option that makes one of the original choices look clearly superior simplifies our decision architecture.

Seminal research

Joel Huber, John W. Payne, and Christopher Puto (1982), "Adding Asymmetrically Dominated Alternatives: Violations of Regularity and the Similarity Hypothesis," published in the Journal of Consumer Research.