Framework · Influence · Influence
The contrast principle
The second of two things looks further from the first than it actually is. Contrast amplifies every principle: an expensive item first makes the next look modest, and a large refused request makes the next look small. It is nearly invisible to the people it affects, and intuition often predicts the wrong order.
Plain label: order changes perceived sizeAlso known as: contrast, perceptual contrast, price order, sequence effects
The principle (Ch.1, pp.9-11) INF-M-04 (Influence Ch.1, p.9). Weight, temperature, attractiveness and price are all judged relative to what came just before. Practitioners in the book sell the expensive item first, raise add-ons only after the main commitment and one at a time, and show weaker comparison options first.
Where it reappears. Inside rejection-then-retreat (Ch.2, pp.31-32), in the staged ally of a good-cop routine (Ch.5, p.142) and in serial price cuts (Ch.6, pp.176-177).
Checks at pricing and checkout [S].
- Are prices shown premium-first (in-t-fn-06)?
- Are add-ons offered only after the main choice, one at a time, with a running total (in-t-fn-07)?
- Is the longest billing term shown first (in-t-rc-22, our extension)?
- Is every comparison option a real, purchasable option?
Evidence. Order and anchoring effects are among the best-replicated findings in judgment research; their size on a given pricing page varies and should be tested.
Sources
Influence · Robert Cialdini
Ch.1, p.9 · Ch.2, p.31
Source IDs: INF-M-04
Book content is paraphrased, never quoted at length. Last verified October 24, 2026.
Your product
Find the stage your product is stuck in
Gamify It reads your product, picks the one move that matters at its stage, and sizes the test to your traffic. Connecting is free; a Pro subscription starts it.