FA-85973 / Game economy crafting balance / Member archive

Vendor sell saturation: Saturated junk sells for zero · case 03

Low-value items pay nothing once saturated though a unit is consumed.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Selling qty units after `sales` units already sold today. Daily cap 20 units total; excess is returned. Per unit, with done = units sold today before it: saturation = min(60, 5*done) percent; unit = floor(base*(100-sat)/100), then floor(unit*(100+bonus)/100) with bonus neutral 0, friendly 5, honored 10; each unit pays at least 1.

Why this case matters

Game economies leak or destroy currency when one crafting or pricing rule is off by one boundary, rounding stage or state update; the defect is observable in exact integer outcomes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
cheap junk at saturation #1	`{"gold": 0, "returned": 0, "sold": 3}`	`{"gold": 3, "returned": 0, "sold": 3}`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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