Behavioral Advertising Map

← Decoder · The Vulnerabilities

The Vulnerabilities Goal: money Documented finding — Supported by a specific experimental or empirical result.

Anchored & decoy pricing

also: price anchoring · decoy effect · asymmetric dominance

A high reference price (or a deliberately unattractive ‘decoy’ option) is shown first so the option the seller wants you to pick looks like a bargain by comparison — your judgement is pulled toward the anchor before you ever weigh the thing on its own merits.

Vulnerabilities it exploits

  • Anchoring & adjustment

    Robust evidence strength: Well-replicated or backed by strong primary evidence.

    Tversky & Kahneman, “Judgment under Uncertainty: Heuristics and Biases,” Science 185 (1974)

    One of the most reliably replicated effects in judgment research; an initial reference value pulls subsequent numerical estimates toward it, even when the anchor is arbitrary.

  • Loss aversion

    Robust evidence strength: Well-replicated or backed by strong primary evidence.

    Kahneman & Tversky, “Prospect Theory: An Analysis of Decision under Risk,” Econometrica 47 (1979)

    The value function is steeper for losses than gains. The popular “2:1” ratio is a later, more precise estimate (loss-aversion coefficient ≈ 2.25; Tversky & Kahneman, 1992) — it is not stated as an exact figure in the 1979 paper.

The evidence

What we actually know

Tversky & Kahneman (1974) Robust evidence strength: Well-replicated or backed by strong primary evidence.

“Judgment under Uncertainty: Heuristics and Biases”

Science 185, no. 4157

Introduced anchoring-and-adjustment: an initial value biases final numerical estimates toward it, even when the anchor is plainly arbitrary.

Luguri & Strahilevitz (2021) Robust evidence strength: Well-replicated or backed by strong primary evidence.

“Shining a Light on Dark Patterns”

Journal of Legal Analysis 13, no. 1

Notably, tripling or quadrupling the price of the unwanted program had no significant effect on uptake — manipulation of the choice architecture mattered far more than price.

In the wild

  • A ‘was $199, now $89’ strike-through where the $199 was never a real selling price, anchoring the discount.

    Common e-commerce pattern; see FTC guidance on deceptive reference pricing.

  • A three-tier pricing table with a deliberately poor middle ‘decoy’ tier that exists only to make the top tier look reasonable.

The antidotes

What helps

Evidence-backed

  • Pro-consumer defaults and transparent, all-in pricing remove the manipulative reference point (Thaler & Sunstein on sludge).

Practical / common-sense

  • Decide your own ceiling before you look at the seller’s prices, so their number isn’t the anchor.

Where the law stands

Different rules in different places

The rules are not the same everywhere — and they move. We show each jurisdiction separately rather than implying one global rulebook.

  • USIn force

    FTC Act §5 / Rule on Unfair or Deceptive Fees (‘junk fees’)

    Deceptive reference pricing and hidden mandatory fees can be actionable as unfair or deceptive practices.