Denomination Effect
We are less likely to spend large bills than coins or small bills of equivalent value.
The denomination effect is a form of the money illusion, and is the tendency to spend more money when it is denominated in small amounts. People are more likely to spend smaller amounts (coins, $1 bills) than larger amounts ($100 bills) of equivalent total value. Casinos exploit this by converting cash to chips — the abstraction from physical denominations reduces inhibitions around spending.
What it looks like in the wild.
- Everyday life Breaking a $100 People avoid spending a $100 bill because it 'feels big', but spend the same money easily once broken into smaller bills.
Someone has already built a business on this.
Biases are not only private errors. They are design targets — patterns deliberately engineered into interfaces because they reliably work.
- Games Premium Currency Abstraction In-game currencies are sold in bundles that don't cleanly map to item prices, forcing unused currency balances that feel like sunk cost and drive further purchases.
Recognising a definition is not the same skill as spotting it.
Two scenarios from the app, with distractors drawn from the same family of biases — which is what makes them hard.
A shopper uses coins and small notes for impulse purchases without guilt, but would not use a hundred-dollar bill for the same items, because breaking a large denomination feels more significant than spending several small amounts.
You find a $20 bill in an old jacket. You decide to keep it as 'emergency money' and spend the smaller bills in your wallet on your morning coffee.
Biases rarely arrive alone.
Understand more. Assume less.
188 biases, 18,869 scenarios, and a record of how you actually decide.
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