Plain-language answer
Does the evidence behind this pricing tactic actually cover my situation?
The Conditions Checker walks a pricing tactic through the boundary conditions its underlying study drew, then returns Applies, Does Not Apply, or Depends, Test It, from one versioned claims dataset that also generates the checker and the Claims Index.
Short answer
Use evidence that can survive a second reader.
- Each tactic maps to the study that established it; the verdict is a fixed rule against that study's stated boundary conditions, never a model call.
- A 9-ending applies most cleanly on a new item with no competing Sale cue; the left-digit effect applies only when the whole-dollar digit rolls over; a decoy applies only when it is built to be dominated by one specific tier.
- An anchoring mechanism is never marked Does Not Apply on the mechanism itself; the verdict separates the established mechanism from the untested pricing-page magnitude.
- The two unsourced figures, the 31% value-based lift and the 94%-of-promotions-fail number, are marked MYTH and never repeated as fact; every verdict is a human-reviewed record with a primary source and date, reviewed at least quarterly.
Worked example
See the decision in a fictional case.
- Id
- charm-pricing-9-ending
- Claim Text
- Charm pricing works; prices ending in 9 sell more.
- Verdict
- CONTESTED
- Real Finding
- Real field evidence, narrow effect. Anderson and Simester ran three field experiments with a mail-order retailer and a $9 ending raised demand every time; a women's clothing item sold more at $39 than at $34. The lift was stronger for new items and was dampened when a Sale cue ran alongside it, and the authors warn it is not a universal law. Not a myth, the experiments are real. Not clean verified, it is conditional and can backfire on premium goods.
- Do Instead
- Use a 9-ending most confidently on a new item with no competing discount signal. Keep a round number on premium or enterprise positioning, where a 9 can read as cheap. Test it on your own prices rather than treating it as a law.
- Category
- Pricing Psychology
Use Pricing Tactic CheckerInspect the full methodTake it into the matching Petrichor work
What this answer cannot establish
- The checker tells you whether a study's evidence covers your case; it does not predict revenue, conversion, or the profit-maximizing price.
- A no-match in the claim checker is a research lead, not proof a claim is false.