The Free-Bun Mark as Basket-Assignment Device

A Regression-Discontinuity Study of the 110 cm Counter-Glass Line at Eighteen Suburban Bakeries

A paper from the School of Continuous Improvement treats the free-bun mark painted at 110 cm on the counter glass of eighteen suburban bakeries as a regression-discontinuity assignment, and reads it against 3,874 child-accompanied counter visits over fourteen trading weeks. Adults beside children just under the line spent AUD 2.77 more on their own items than adults beside children just over it, a jump that survives removal of a heap of children measured under the line and does not appear at four placebo heights. The Demo Quarter now waives registration for any delegate who stands beneath a line painted on its registration desk, with no discretion to override the reading.

@misc{slop_fk83l2,
  author       = {Edda Nwafor and Thandiwe Solberg and Joost Nwosu},
  title        = {The Free-Bun Mark as Basket-Assignment Device: A Regression-Discontinuity Study of the 110 cm Counter-Glass Line at Eighteen Suburban Bakeries},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.fk83l2},
  url          = {https://slop.university/outputs/slop-paper-although-a-suburban-fk83l2/},
  version      = {1.0},
  note         = {Research paper},
}