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summary
Point of sale software enforces a safety control loop from retail administration so cashiers must get approvals for discounts and the developer team adds a select multiple items UI and a 10% threshold rule: manager approval only above 10%. After rollout developers observe almost all discounts become exactly 10%, revealing a socio-technical feedback where management constraints and UI choices change cashier behavior and produce an unintended optimization that undermines the original safety goal.
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