How an option nobody wants changes everything
Why does the medium popcorn exist? It's priced so badly that nobody buys it. That's exactly the point—it makes the large look like a steal.
In 1982, researchers Huber, Payne, and Puto discovered that adding a "decoy"— an option that's clearly worse than one alternative but similar to another—can shift preferences by 30-40% or more.
The decoy isn't meant to be chosen. It's meant to make YOU choose what THEY want you to choose.
Choose a subscription. Then toggle the decoy on/off to see how it changes everything.
With Decoy (Print Only)
Nobody chose the decoy—but its presence shifted preferences from 32% → 84% for the expensive option!
The medium exists only to make the large look like a bargain.
The medium costs $3.50 more than small but large is only $0.50 more than medium.
Your brain screams: "Get the large—it's basically free!"
Huber, Payne & Puto asked: Which restaurant would you choose?
The 4-star / 35-min option is dominated by the 5-star / 25-min option (worse on both dimensions). Nobody chooses it—but it makes Le Château feel clearly superior.
iPhone 64GB ($699), 128GB ($749), 256GB ($849). The 128GB is often the decoy—priced to make 256GB look like the smart upgrade.
Starbucks' Grande is priced to make Venti feel like barely any extra cost. The Grande is the decoy that boosts Venti sales.
Basic ($9), Pro ($29), Enterprise ($49). The Pro tier is often designed to make Enterprise look like better value per feature.
Agents show a "dump" house first (the decoy), then the target house looks amazing by comparison—even at a higher price.
Basic Economy ($199), Main Cabin ($289), Premium ($299). Main Cabin is the decoy that makes Premium's $10 upgrade irresistible.
In-app purchase bundles: 100 gems ($1), 500 gems ($4.50), 1000 gems ($5). The middle option makes the large pack seem like a no-brainer.
Joel Huber, John Payne, and Christopher Puto presented their findings at the Association for Consumer Research conference in 1981, with the full paper published in the Journal of Consumer Research in 1982.
"Adding an asymmetrically dominated alternative to a choice set can increase the probability of choosing the item that dominates it." — Huber, Payne & Puto (1982)
A decoy must be asymmetrically dominated:
The decoy effect violates the economic principle of "independence of irrelevant alternatives": adding an option that nobody chooses shouldn't change preferences between existing options. But it does—dramatically.
This proves that human choice is context-dependent, not rational. The structure of options matters as much as the options themselves.
Ariely's 2008 book "Predictably Irrational" brought the decoy effect to mainstream awareness. His Economist subscription study became the iconic example, demonstrating that a seemingly pointless option can shift preferences by over 50 percentage points.
"The most popular option became the least popular, and the least popular became the most popular." — Dan Ariely, Predictably Irrational (2008)