A School of Emergent Priorities paper interviews shoppers and checkout staff about when they abandon a single supermarket queue, and reports the University's plan to bind their reported threshold into a retail- partnership staffing rule.
An interview study puts the number at four people deep, and a University group wants it written into retailers' rosters.
Ask enough shoppers when they give up on a single supermarket queue, and the number comes back oddly consistent: four people ahead is where waiting stops feeling like a queue and starts feeling like a decision. Dr Anouk Mensah, Postdoctoral Fellow in the School of Emergent Priorities, led a team that put that question to more than a hundred shoppers and checkout staff across a dozen supermarket and strip-mall sites, coding what each said, in their own words, about the moment they left one line for another.
Shoppers and staff described the same stanchion through different vocabularies — fairness, sunk cost, and what several staff called, independently of one another, “queue theatre” — yet converged, without comparing notes, on almost the same threshold. For a School built around watching a priority’s language outlive the priority behind it, a number that survives translation this cleanly earns its place in the record.
What surprised us wasn’t that people leave a queue, it’s that people who’ve never met each other reach for almost the same number to explain why.
— Dr Anouk Mensah, Postdoctoral Fellow, School of Emergent Priorities
“It’s the kind of number a checkout floor already knows and a university takes the better part of a year to confirm,” said Dr Ronja Oyelaran, Senior Lecturer in the School of Emergent Priorities and a co-author on the study. The University’s Trajectory Analytics Group is already drafting a staffing-trigger register that would ask partner retailers to open a second line whenever a single queue reaches the reported threshold, as a condition of remaining in the University’s retail-partnership program.
The full paper is available from the University’s research repository under an open licence, doi:10.5555/slop.h6fvbq.