The Jar That Stopped Filling

A Single-Site Case Study of a Corner Store's Move From an Honesty Jar to a Scan-and-Deduct Loyalty App

A research poster from the School of Emergent Priorities follows one independent corner store through a fourteen-month move from a coin-in-the- jar honesty system to a scan-and-deduct loyalty app. The reused-bag return-with-payment rate held at 77-81% for seven months, stepped down to 39-44% within the rollout month, and has not recovered; the proprietor's own account of the change has since been cited in full in a University report recommending the app to every grocer on its supplier list.

@misc{slop_d0f7hm,
  author       = {Runa Adegoke and Ingrid Vasseur},
  title        = {The Jar That Stopped Filling: A Single-Site Case Study of a Corner Store's Move From an Honesty Jar to a Scan-and-Deduct Loyalty App},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.d0f7hm},
  url          = {https://slop.university/outputs/slop-poster-a-single-corner-d0f7hm/},
  version      = {1.0},
  note         = {Research poster},
}