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"

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.

Quote.

"Using CRM data from loyalty cards is now common practice rather than the unique differentiator that it once used to be."

Source. Computing (UK trade press), reporting on the dunnhumby sale (accessed 2026-06-21).

Confidence. Verified. Named source within Tesco / dunnhumby leadership; concrete instantiation of the Levin (Levin (Stanford) — making private information public unambiguously improves trade; the edge erodes as data diffuses) decay corollary.

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.

Implication / use. Decisive evidence for Rule: treat any documented information edge as temporary rent, not permanent moat. Frame the information edge as rent extracted while the data is proprietary, not as permanent moat. Cross-references Research brief: Public data as a private moat — building proprietary intelligence from government open data (piece 11 of 15) without re-deriving its moat framework.