FA-85363 / Ride-hailing fare and surge pricing / Member archive

Surge damping applied to increases instead of decreases · case 03

Surge creeps up slowly during a demand spike and collapses instantly afterwards.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Each interval gives [open requests, idle drivers]. The raw multiplier (tenths) is 30 when the exact ratio requests/drivers >= 3, 20 when >= 2, 15 when >= 1.5, 12 when >= 1.2, else 10; with zero drivers it is 30 if any request is open, else 10. The published multiplier rises immediately to the raw value but falls by at most 2 tenths per interval, starting from prev. Return the published multiplier per interval.

Why this case matters

Ride-hailing prices are computed per trip at scale; ordering, unit and boundary slips become systematic over- or under-charging.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: hysteresis direction	`[10, 12, 10]`	`[13, 15, 13]`	Failed

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