Decoy Effect (Asymmetric Dominance)
Edited by Paweł Raja, PhD · Published · Updated
Definition
Decoy Effect (Asymmetric Dominance) is the phenomenon where consumers change their preference between two options when presented with a third, asymmetrical option ('the decoy').
Decoy Effect (Asymmetric Dominance) examples
Given a choice between Small popcorn ($3) and Large ($7), most buy Small. Introducing Medium ($6.50) as a decoy makes Large ($7) look like an incredible value.
- A subscription priced just below the premium tier, but with far less value, pushes buyers toward the premium option.
- Adding a deliberately unattractive middle size makes the large look like the sensible buy.
How to design for it (nudge strategy)
Incorporate a tier that is priced close to your premium tier but offers significantly less value, making the premium tier the obvious choice.
Ethical use: design for choices people would endorse on reflection — a nudge, not sludge. Be transparent and keep opting out easy.
Related biases
Cite this page
Behavioral Economics Lab. "Decoy Effect (Asymmetric Dominance) – Definition, Examples & Evidence." Behavioral Economics Lab, https://www.behavioraleconomicslab.com/biases/decoy-effect.