How much money would you accept to let a stranger cut in front of you in a grocery line? Most people can answer. How much would you accept to let a stranger slap your child? Most people refuse to answer — not because the amount is too high, but because the question itself feels wrong.
The Framework
Taboo tradeoffs are exchanges between sacred values and secular ones that people refuse to contemplate, regardless of the terms. Philip Tetlock's research shows that certain categories of value — human life, bodily integrity, national sovereignty, religious principles — are treated as 'sacred' and cannot be traded against money, convenience, or other secular goods without moral outrage. Asking someone to name their price for a sacred value doesn't just produce a high number — it produces anger, disgust, and 'moral cleansing' behavior.
Kahneman presents taboo tradeoffs in Chapter 33 as an extreme case of the evaluability problem: sacred values and secular values exist on incompatible scales, and the mental act of making them commensurable (converting a child's safety into dollars) feels morally contaminating.
Where It Comes From
Chapter 33 of Thinking, Fast and Slow discusses taboo tradeoffs alongside preference reversals. Tetlock's research showed that merely asking people to consider trading sacred values against secular ones triggered anger and increased support for punishing the person who asked the question.
> "Taboo tradeoffs are exchanges that violate a sense of the sacred." — Thinking, Fast and Slow, Ch 33
The Implementation Playbook
Marketing: Never frame your product's value in terms that create taboo tradeoffs. 'How much is your child's safety worth?' triggers moral outrage, not purchase intention. Instead, frame the product in secular-secular terms: 'This car seat earned the highest safety rating AND costs less than the leading competitor.'
Policy and Negotiation: Recognize when a counterpart treats a position as sacred rather than secular. Offering more money for something they consider non-negotiable won't just fail — it will damage the relationship. Fisher's interests-based approach in Getting to Yes is the correct response: identify the underlying interest behind the sacred position and find a way to satisfy it without forcing a sacred-secular trade.
Organizational Change: Some organizational values are treated as sacred by employees (company mission, team identity, founding principles). Framing changes as trading these values for profit triggers the taboo-tradeoff response. Instead, frame changes as better ways to serve the sacred values.
Key Takeaway
Taboo tradeoffs mark the boundary where economic rationality stops and moral psychology begins. Treating every value as tradeable against money is not just insensitive — it's psychologically inaccurate. Some values are sacred, and attempting to price them produces outrage rather than negotiation.
Continue Exploring
[[Preference Reversals]] — The broader category of which taboo tradeoffs are the extreme case
[[Dual Entitlements]] — The fairness principles that constrain acceptable economic exchanges
📚 From Thinking, Fast and Slow by Daniel Kahneman — Get the book