Psychological

Decoy Effect

What it is

Introducing an inferior third option to make one of two other options appear more attractive.

How it works

When choosing between two options, adding a third "decoy" that is clearly worse than one of them (but comparable) shifts preference toward the dominant option. The decoy is never meant to be chosen; it exists to make the target option look like a better deal by comparison.

Real-world examples

  • •A movie theater offering small popcorn for $4, large for $7, and medium for $6.50 — making the large seem like the best value.
  • •A SaaS product offering Basic ($10), Pro ($25), and Enterprise ($24) tiers where Enterprise lacks a key Pro feature, pushing buyers to Pro.
  • •A real estate agent showing a slightly run-down house at the same price as a nicer one to make the nicer one feel like a steal.

Ethical guidelines

  • ●All options should deliver genuine value at their price point.
  • ●Do not create options that exist solely to manipulate choice architecture.
  • ●Be transparent about what each tier or option includes.

How to defend against it

  • ►Evaluate each option independently rather than by comparison.
  • ►Define your needs and budget before looking at options.
  • ►Remove the least attractive option mentally and see if your preference changes.

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