{"id":1483,"slug":"tesco-loyalty-card-now-common-practice-edge-decay","title":"Tesco / Computing on dunnhumby sale — \"Using CRM data from loyalty cards is now common practice rather than the unique differentiator that it once used to be\"","kind":"reference","scope":"business","status":"current","audiences":["kevin","smb-owner","candid-team"],"topics":["data-moats","information-asymmetry","customer-retention"],"reference_body":"**Claim.** Even Tesco's own data leadership now publicly states that loyalty-card CRM data is common practice rather than a unique differentiator — direct evidence that the very mechanism that gave Tesco its 1990s edge has commoditised.\n\n**Quote.**\n> \"Using CRM data from loyalty cards is now common practice rather than the unique differentiator that it once used to be.\"\n\n**Source.** Computing (UK trade press), reporting on the dunnhumby sale (accessed 2026-06-21).\n\n**Confidence.** Verified. Named source within Tesco / dunnhumby leadership; concrete instantiation of the Levin ([[levin-stanford-public-information-shrinks-asymmetry]]) decay corollary.\n\n**Caveats.** \"Common practice\" understates the cost of executing the mechanism well — competitors copy the *idea*, not the capability. So decay is real but not total. The edge erodes from a unique differentiator to a parity capability over ~20-30 years in this case.\n\n**Implication / use.** Decisive evidence for [[rule-treat-information-edge-as-temporary-rent]]. Frame the information edge as rent extracted *while* the data is proprietary, not as permanent moat. Cross-references [[research-brief-public-data-private-moat]] without re-deriving its moat framework.","rationale_body":null,"metadata":null,"links":{"outgoing":[{"slug":"research-brief-public-data-private-moat","title":"Research brief: Public data as a private moat — building proprietary intelligence from government open data (piece 11 of 15)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"research-brief-information-asymmetry-decision-edge-june-2026","title":"Research notes (capture-layer): the affirmative, inward decision-edge case for data intelligence — information asymmetry applied to pricing, demand, risk, retention, targeting (June 2026)","kind":"research-notes","scope":"business","link_type":"depends-on"},{"slug":"levin-stanford-public-information-shrinks-asymmetry","title":"Levin (Stanford) — making private information public unambiguously improves trade; the edge erodes as data diffuses","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"tesco-clubcard-overtook-sainsburys-doubled-share","title":"Tesco Clubcard — overtook Sainsbury's in 1995 within a year of launch; helped double grocery market share within ~3 years","kind":"reference","scope":"business","link_type":"relates-to"}],"incoming":[{"slug":"rule-treat-information-edge-as-temporary-rent","title":"Rule: treat any documented information edge as temporary rent, not permanent moat","kind":"rule","scope":"business","link_type":"depends-on"},{"slug":"rule-three-thresholds-before-claiming-information-edge","title":"Rule: three thresholds before claiming an information edge — volume to clear noise, clean data, an actual decision someone will act on (and timeliness before commoditisation)","kind":"rule","scope":"business","link_type":"depends-on"}]},"created_at":"2026-06-21T01:14:48.803Z","updated_at":"2026-06-21T01:14:48.803Z"}