The Truth About Relativity

Ariely opens with the observation that human valuations are not absolute. They are relative — formed by comparison to whatever reference points happen to be available at the moment of decision. The chapter's anchor experiment is the famous Economist subscription pricing case.

The Economist once offered three subscription tiers: web-only for $59, print-only for $125, and print-plus-web for $125. Almost no one chose print-only. But removing it dramatically changed behavior on the other two options, because print-only existed to make print-plus-web look like an obvious bargain. Without the decoy, fewer people chose the highest tier. The decoy's only function was to manipulate relative comparison.

The chapter argues that decoy effects are not curiosities — they are pervasive features of how humans evaluate options. Real estate agents show prospective buyers a deliberately bad house first, then the target house, because the relative comparison makes the target look better than it would in isolation. Restaurants list a deliberately expensive bottle of wine to make their mid-priced wines look reasonable. Every retail environment is engineered to create relative comparisons that favor the items the seller wants you to buy.

The practical implication is that any decision made by comparison to immediately-available alternatives is vulnerable to manipulation through what alternatives the environment presents. The defense is to evaluate options against external reference points (your budget, your needs, your alternatives elsewhere) before allowing the in-context comparisons to shape your decision.

Removing the dominated print-only option collapsed the print-plus-web share from 84% to 32%: the decoy existed only to make the bundle look like a bargain by comparison, and without something obviously worse to beat, buyers reverted to the cheap web-only tier. Ariely calls this the decoy effect, and he shows the same machinery in a Williams-Sonoma bread maker that sold poorly until a pricier model was added beside it — the original now looked reasonable and its sales jumped. The underlying habit is that humans rarely judge value in absolute terms; we compare what is easy to compare and avoid the hard cross-category comparisons, so a seller who controls the available comparisons effectively controls the choice. The chapter's practical counsel is to widen the frame deliberately — question whether an option looks good on its own merits or only relative to a neighbor engineered to flatter it, and recognize that the 'great deal' is often a relativity trap rather than a real one. Ariely's broader point is that the more aware we are of our susceptibility to relativity, the better we can curb it: by breaking the cycle of comparison and judging each option against our actual needs and budget rather than against whatever the seller chose to place beside it.