Influence: The Psychology of Persuasion · chapter 7 · id influence-c7-08-commodity-theory-brock-1968-pr

“Commodity theory (Brock, 1968) provides the theoretical foundation: any commodity that can be possessed will be valued to the extent that it is unavailable.”

holdsconfidence: high⚠ extracted by pipeline, re-audit pending

Receipts

Lynn (1991), Scarcity Effects on Value: Quantitative Review of Commodity Theory, Psychology & Marketing 8(1)paywalled — manual check queued

Quantitative review found overall support for the scarcity-value relationship, though effect sizes varied substantially.

Lynn (1991), Scarcity Effects on Value: A Quantitative Review of the Commodity Theory Literature, Psychology and Marketing 8(1)FLAGGED: DOI not in registry

Meta-analysis of commodity theory research confirms that unavailability enhances desirability, with a moderate average effect size across 41 studies testing Brock's commodity theory predictions.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.