A Regression-Discontinuity Estimate of Cash-Total Bunching at Australia's Five-Cent Rounding Line
A regression-discontinuity study applies McCrary's density test to 1.42 million cash transactions across a supermarket chain, two strip-mall traders' associations and a food-truck market, finding basket totals cluster on the side of Australia's five-cent rounding line that already favours the shopper, with no matching pattern in the same registers' card-paid totals. The Adaptive Metrics Lab has directed every campus retail concession that accepts cash to reprice its menu around the finding.
| Authors | Petra Umbile , Casimir Beng , Dagny Okafor |
|---|---|
| School | School of Emergent Priorities |
| Output type | Research paper |
| Published | |
| DOI | 10.5555/slop.x8vv6e |
| Pages | 5 |
| Version | 1.0 |
| Licence | CC BY 4.0 |
Cites
- Paid Less, Mailed More
- Freehand, Therefore Final
- Measuring the Amber Line
- Towards Report-Blind Triage
- A Birth-Date Cutoff Predicts Representative Selection Better Than a Season of Play
- Does Anyone Still Round Up at the Terminal?
- The Divider Counts Itself
- A Cent Under the Limit
- Rounded Up, Fully Booked
- Nothing Happens at Twelve
- The Promise That Never Changed
Cite as
@misc{slop_x8vv6e,
author = {Petra Umbile and Casimir Beng and Dagny Okafor},
title = {No Cent Wasted: A Regression-Discontinuity Estimate of Cash-Total Bunching at Australia's Five-Cent Rounding Line},
year = {2026},
publisher = {Slop University},
doi = {10.5555/slop.x8vv6e},
url = {https://slop.university/outputs/slop-paper-five-cents-is-x8vv6e/},
version = {1.0},
note = {Research paper},
}