The Decoy Effect: How a Third Option Changes Your Choice

Adding an option that few people choose can shift demand towards another. Retailers and subscriptions use it widely.

By Iris Penhaligon | Sep 22, 2026 | 4 min

The decoy effect occurs when the presence of a third, less attractive option makes one of the other options look better by comparison.

It is also called asymmetric dominance, because the decoy is clearly worse than one option but not the other.

I A classic example

Suppose a cinema offers a small popcorn and a large popcorn. Adding a medium size priced close to the large can make the large look like better value, increasing sales of the large.

II Where you see it

— Subscription plans with three tiers
— Coffee cup sizes
— Product bundles

III Why it works

People evaluate options relative to each other rather than in absolute terms. The decoy provides an easy comparison.

IV As a consumer

Focus on what you actually need and the absolute price rather than relative value.

This is general educational information about economics, not financial, investment, or tax advice. Consult a qualified, licensed professional before making financial decisions.

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