Index

Cognitive Biases

Decoy Effect

A phenomenon where adding a third, inferior option changes the preference between the original two options.

The decoy effect shifts preferences by introducing an asymmetrically dominated option that makes the target choice appear more attractive.

Core question

Has a new option been introduced primarily to make one of the existing options look better?

Example

A SaaS company adds a mid-tier plan that is barely cheaper than the premium plan but far less featured, making the premium tier look like an obvious deal.

How to apply

  1. 1.When evaluating options, remove each one temporarily to see if your preference shifts.
  2. 2.Compare options on absolute value, not relative attractiveness to other options.
  3. 3.Watch for decoys in pricing pages, vendor proposals, and competitive analyses.

Pitfalls

  • ·Seeing decoys everywhere and becoming unable to trust any curated option set.
  • ·Using decoys unethically to manipulate customers into overbuying.
  • ·Forgetting that well-designed choice architecture can genuinely help users.

Questions

Where is the decoy effect most commonly used?

In subscription pricing, menu design, and real estate listings — anywhere a third option can reframe the value of a target option.

Is the decoy effect the same as the framing effect?

They are related but different. Framing changes how the same information is presented. The decoy effect adds a new option to shift relative preference.

Related