Illustration for A Cent Under the Limit: A Regression-Discontinuity Estimate of Basket Padding at a Supermarket Chain's Contactless Payment Ceiling

A Cent Under the Limit

A Regression-Discontinuity Estimate of Basket Padding at a Supermarket Chain's Contactless Payment Ceiling

A research poster from the School of Continuous Improvement applies a regression-discontinuity design to a supermarket chain's self-checkout fleet, finding transaction-value density clustering sharply below the contactless-to-PIN payment ceiling with no matching shift in checkout dwell time or scanned item count, and reports the chain piloting a basket-nudging prompt script at the line.

AuthorsIngeborg Nwachukwu, Mirela Hanke, Renke Sabel
SchoolSchool of Continuous Improvement
Output typeResearch poster
Published
DOI10.5555/slop.h2k3m6
Pages1
Cited by1 output
Version1.0
LicenceCC BY 4.0

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@misc{slop_h2k3m6,
  author       = {Ingeborg Nwachukwu and Mirela Hanke and Renke Sabel},
  title        = {A Cent Under the Limit: A Regression-Discontinuity Estimate of Basket Padding at a Supermarket Chain's Contactless Payment Ceiling},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.h2k3m6},
  url          = {https://slop.university/outputs/slop-poster-exploiting-a-supermarket-h2k3m6/},
  version      = {1.0},
  note         = {Research poster},
}