A new Slop University research paper classifies point-of-sale change-rounding into a four-part framework, and reports a co-op subsidy scheme's audited eligibility rule shifting small traders toward logging trader-favouring rounds in place of the customer-favouring ones they used to give unlogged.
A trading-precinct co-op's new subsidy rule already rewards traders for logging which way a round falls, not for which way it falls.
The School of Continuous Improvement’s evaluation-ecosystem agenda has, this year, reached the five cents a cash till sometimes cannot give back. A new Slop University research paper from the School classifies that moment — the point where a card-exact total meets a cash-rounded one — into a four-part rounding framework, and reports what happened once a trading-precinct co-op began auditing it. The paper reflects the School’s standing view that no transaction is too small to reward a closer look.
Across sixteen weeks and ninety-six sites — supermarket self-checkouts, strip-mall traders, food trucks — the research team classified thousands of shortfall moments by who the round favoured and whether the terminal wrote it down. Twelve weeks after the co-op tied its EFTPOS-fee subsidy to a site’s logged share, the team returned to find the ranking of the four categories reversed.
A subsidy scheme that pays equally for any logged round was always going to get more logging, not more fairness. We built the framework to describe the shift, not to referee it.
— Dr Mirela Hanke, Postdoctoral Fellow and Deputy Convenor, Living Dashboard, School of Continuous Improvement
Associate Professor Casimir Beng, Lead of the Adaptive Metrics Lab and a co-author on the paper, said the finding sits comfortably alongside the Lab’s wider work on measurement systems that reward being measured: “the till was never the problem; the ledger is what changed.”
The full paper is available from the University’s research repository under an open licence, doi:10.5555/slop.crwk9y.