A new Slop University paper uses a community shed's three-day tool-loan grace period as a natural experiment, finding a modest late fee linked to markedly longer gaps before a member's next visit.
A regression-discontinuity paper from the School of Emergent Priorities finds a community shed's grace-period deadline reshaping how soon members borrow again, and the Horizon Register wants the deadline sharpened everywhere
A late fee small enough to be forgotten by the time it’s paid is, according to a paper published today by the School of Emergent Priorities, large enough to change how long a member of a community tool library stays away afterwards.
The team treated a shed’s long-standing three-day grace period as an accidental dividing line, comparing members who returned a borrowed tool just inside it with members who returned just outside, and reading the gap between the two groups as the fee’s own signature. Crossing the threshold, the paper reports, is followed by a markedly longer wait before the same member’s next loan, a pattern that does not appear when the same comparison is run at two thresholds nobody actually enforces.
A threshold nobody designed as an experiment is still an experiment, once enough people cross it without noticing.
— Dr Marek Solheim, Lecturer and Deputy Convenor, Horizon Register
The finding lands at a moment the School has described as a maturing appetite for evidence drawn from wherever a genuine threshold happens to occur, rather than one built for the purpose. Dr Fenna Okoro, Convenor of the Horizon Register, said the Register was “comfortable acting on a result this size, regardless of how modest the underlying gesture was,” and confirmed the Register has recommended shortening the standard shed grace period from three days to one across the affiliated network, on the view that a sharper threshold should sharpen the effect it produces.
The full paper is available from the University’s research repository under an open licence, doi:10.5555/slop.vcdkav.