{"abstract":"Low-priced items stay flat despite a 1% overshoot.","category":"Game economy crafting balance","checks":8,"contract":"If target <= 0 the price is only clamped to [floor, ceiling]. If sold > target: pct = min(20, floor((sold-target)*100/target)), step = floor(price*pct/100) but at least 1 when pct > 0, new = price + step. If sold < target: pct = min(15, floor((target-sold)*100/target)), new = price - floor(price*pct/100). Otherwise unchanged. Result clamped to [floor, ceiling].","evaluation_group":"w2-game-economy-crafting-balance-market-rebalance","failed_approach":"Forcing a step whenever it is zero raises the price even at 0%.","family":"w2-game-economy-crafting-balance-market-rebalance-minimum-rise-step","id":"FA-86266","implementations":{"attempt":{"sha256":"3f2a1bb2cf099d937420571aebc6dec531aecc534c7d518d1a7e0ab0f8354076","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(price, sold, target, floor, ceiling):\n    if target <= 0:\n        return min(max(price, floor), ceiling)\n    if sold > target:\n        pct = min(20, (sold - target) * 100 // target)\n        step = price * pct // 100\n        if step == 0:\n            step = 1\n        new = price + step\n    elif sold < target:\n        pct = min(15, (target - sold) * 100 // target)\n        new = price - price * pct // 100\n    else:\n        new = price\n    return min(max(new, floor), ceiling)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('fault site minimum rise step #1', [99, 904, 890, 36, 258], 100),\n  ('fault site minimum rise step #2', [50, 76, 75, 35, 345], 51),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [99, 1188, 396, 6, 782], 118)],\n [('fault site minimum rise step #1', [9, 898, 884, 8, 34], 10),\n  ('fault site minimum rise step #2', [99, 806, 793, 1, 532], 100),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [99, 1188, 396, 6, 782], 118),\n  ('control #2', [9, 0, 1, 47, 499], 47)],\n [('fault site minimum rise step #1', [50, 830, 817, 5, 563], 51),\n  ('fault site minimum rise step #2', [50, 80, 79, 32, 704], 51),\n  ('partial repair boundary #1', [50, 734, 732, 21, 710], 50),\n  ('partial repair boundary #2', [99, 623, 621, 46, 1542], 99),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [9, 0, 1, 47, 499], 47),\n  ('control #2', [1000, 0, 0, 7, 47], 47)],\n [('fault site minimum rise step #1', [99, 924, 909, 17, 254], 100),\n  ('fault site minimum rise step #2', [99, 904, 890, 36, 258], 100),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('control #1', [736, 68, 66, 28, 100], 100),\n  ('control #2', [3, 75, 76, 12, 1170], 12)],\n [('fault site minimum rise step #1', [50, 76, 75, 35, 345], 51),\n  ('fault site minimum rise step #2', [9, 898, 884, 8, 34], 10),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [1000, 5, 5, 37, 1007], 1000),\n  ('control #2', [50, 11, 10, 38, 410], 55)]]\nfor label, args, expected in cases[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"87ea344137244f4a455c72e6e9ef1d17223cb522994d1e2b0f0f9e00a0977b0e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(price, sold, target, floor, ceiling):\n    if target <= 0:\n        return min(max(price, floor), ceiling)\n    if sold > target:\n        pct = min(20, (sold - target) * 100 // target)\n        step = price * pct // 100\n        if pct > 1:\n            step = max(step, 1)\n        new = price + step\n    elif sold < target:\n        pct = min(15, (target - sold) * 100 // target)\n        new = price - price * pct // 100\n    else:\n        new = price\n    return min(max(new, floor), ceiling)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('fault site minimum rise step #1', [99, 904, 890, 36, 258], 100),\n  ('fault site minimum rise step #2', [50, 76, 75, 35, 345], 51),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [99, 1188, 396, 6, 782], 118)],\n [('fault site minimum rise step #1', [9, 898, 884, 8, 34], 10),\n  ('fault site minimum rise step #2', [99, 806, 793, 1, 532], 100),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [99, 1188, 396, 6, 782], 118),\n  ('control #2', [9, 0, 1, 47, 499], 47)],\n [('fault site minimum rise step #1', [50, 830, 817, 5, 563], 51),\n  ('fault site minimum rise step #2', [50, 80, 79, 32, 704], 51),\n  ('partial repair boundary #1', [50, 734, 732, 21, 710], 50),\n  ('partial repair boundary #2', [99, 623, 621, 46, 1542], 99),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [9, 0, 1, 47, 499], 47),\n  ('control #2', [1000, 0, 0, 7, 47], 47)],\n [('fault site minimum rise step #1', [99, 924, 909, 17, 254], 100),\n  ('fault site minimum rise step #2', [99, 904, 890, 36, 258], 100),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('control #1', [736, 68, 66, 28, 100], 100),\n  ('control #2', [3, 75, 76, 12, 1170], 12)],\n [('fault site minimum rise step #1', [50, 76, 75, 35, 345], 51),\n  ('fault site minimum rise step #2', [9, 898, 884, 8, 34], 10),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [1000, 5, 5, 37, 1007], 1000),\n  ('control #2', [50, 11, 10, 38, 410], 55)]]\nfor label, args, expected in cases[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"7dc83f1ec23fce47be199e3d8778f31c899758503dc408802924c53f9e1cd5be","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(price, sold, target, floor, ceiling):\n    if target <= 0:\n        return min(max(price, floor), ceiling)\n    if sold > target:\n        pct = min(20, (sold - target) * 100 // target)\n        step = price * pct // 100\n        if pct > 0:\n            step = max(step, 1)\n        new = price + step\n    elif sold < target:\n        pct = min(15, (target - sold) * 100 // target)\n        new = price - price * pct // 100\n    else:\n        new = price\n    return min(max(new, floor), ceiling)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('fault site minimum rise step #1', [99, 904, 890, 36, 258], 100),\n  ('fault site minimum rise step #2', [50, 76, 75, 35, 345], 51),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [99, 1188, 396, 6, 782], 118)],\n [('fault site minimum rise step #1', [9, 898, 884, 8, 34], 10),\n  ('fault site minimum rise step #2', [99, 806, 793, 1, 532], 100),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [99, 1188, 396, 6, 782], 118),\n  ('control #2', [9, 0, 1, 47, 499], 47)],\n [('fault site minimum rise step #1', [50, 830, 817, 5, 563], 51),\n  ('fault site minimum rise step #2', [50, 80, 79, 32, 704], 51),\n  ('partial repair boundary #1', [50, 734, 732, 21, 710], 50),\n  ('partial repair boundary #2', [99, 623, 621, 46, 1542], 99),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('control #1', [9, 0, 1, 47, 499], 47),\n  ('control #2', [1000, 0, 0, 7, 47], 47)],\n [('fault site minimum rise step #1', [99, 924, 909, 17, 254], 100),\n  ('fault site minimum rise step #2', [99, 904, 890, 36, 258], 100),\n  ('partial repair boundary #1', [50, 253, 252, 38, 195], 50),\n  ('partial repair boundary #2', [50, 734, 732, 21, 710], 50),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('cheap item rises one #1', [3, 13, 10, 1, 100], 4),\n  ('control #1', [736, 68, 66, 28, 100], 100),\n  ('control #2', [3, 75, 76, 12, 1170], 12)],\n [('fault site minimum rise step #1', [50, 76, 75, 35, 345], 51),\n  ('fault site minimum rise step #2', [9, 898, 884, 8, 34], 10),\n  ('partial repair boundary #1', [99, 623, 621, 46, 1542], 99),\n  ('partial repair boundary #2', [50, 253, 252, 38, 195], 50),\n  ('crash capped at 15 #1', [1000, 0, 40, 1, 5000], 850),\n  ('no target listed #1', [5, 3, 0, 10, 50], 10),\n  ('control #1', [1000, 5, 5, 37, 1007], 1000),\n  ('control #2', [50, 11, 10, 38, 410], 55)]]\nfor label, args, expected in cases[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Deterministic toy contract stipulated for this model; integer or exact arithmetic only, not a reproduction of any specific game engine. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-game-economy-crafting-balance-market-rebalance-minimum-rise-step","generated_at":"2026-09-29T14:50:48.015943+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"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.","repair":"Restore `if pct > 0:\n        step = max(step, 1)` at the minimum rise step step.","root_cause":"The one-coin minimum requires more than 1% excess.","sha256":"e1272bf9b97c778b95c401d49fa8281d9b0d47564904001e66fe12d2625588f5","title":"Daily market rebalance: Cheap items never rise · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.846,"exit_code":1,"observations":[{"actual":100,"check":"fault site minimum rise step #1","expected":100,"passed":true},{"actual":51,"check":"fault site minimum rise step #2","expected":51,"passed":true},{"actual":51,"check":"partial repair boundary #1","expected":50,"passed":false},{"actual":51,"check":"partial repair boundary #2","expected":50,"passed":false},{"actual":10,"check":"no target listed #1","expected":10,"passed":true},{"actual":4,"check":"cheap item rises one #1","expected":4,"passed":true},{"actual":850,"check":"crash capped at 15 #1","expected":850,"passed":true},{"actual":118,"check":"control #1","expected":118,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fault site minimum rise step #1\", \"actual\": 100, \"expected\": 100, \"passed\": true}, {\"check\": \"fault site minimum rise step #2\", \"actual\": 51, \"expected\": 51, \"passed\": true}, {\"check\": \"partial repair boundary #1\", \"actual\": 51, \"expected\": 50, \"passed\": false}, {\"check\": \"partial repair boundary #2\", \"actual\": 51, \"expected\": 50, \"passed\": false}, {\"check\": \"no target listed #1\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"cheap item rises one #1\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"crash capped at 15 #1\", \"actual\": 850, \"expected\": 850, \"passed\": true}, {\"check\": \"control #1\", \"actual\": 118, \"expected\": 118, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.387,"exit_code":1,"observations":[{"actual":99,"check":"fault site minimum rise step #1","expected":100,"passed":false},{"actual":50,"check":"fault site minimum rise step #2","expected":51,"passed":false},{"actual":50,"check":"partial repair boundary #1","expected":50,"passed":true},{"actual":50,"check":"partial repair boundary #2","expected":50,"passed":true},{"actual":10,"check":"no target listed #1","expected":10,"passed":true},{"actual":4,"check":"cheap item rises one #1","expected":4,"passed":true},{"actual":850,"check":"crash capped at 15 #1","expected":850,"passed":true},{"actual":118,"check":"control #1","expected":118,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fault site minimum rise step #1\", \"actual\": 99, \"expected\": 100, \"passed\": false}, {\"check\": \"fault site minimum rise step #2\", \"actual\": 50, \"expected\": 51, \"passed\": false}, {\"check\": \"partial repair boundary #1\", \"actual\": 50, \"expected\": 50, \"passed\": true}, {\"check\": \"partial repair boundary #2\", \"actual\": 50, \"expected\": 50, \"passed\": true}, {\"check\": \"no target listed #1\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"cheap item rises one #1\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"crash capped at 15 #1\", \"actual\": 850, \"expected\": 850, \"passed\": true}, {\"check\": \"control #1\", \"actual\": 118, \"expected\": 118, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":38.865,"exit_code":0,"observations":[{"actual":100,"check":"fault site minimum rise step #1","expected":100,"passed":true},{"actual":51,"check":"fault site minimum rise step #2","expected":51,"passed":true},{"actual":50,"check":"partial repair boundary #1","expected":50,"passed":true},{"actual":50,"check":"partial repair boundary #2","expected":50,"passed":true},{"actual":10,"check":"no target listed #1","expected":10,"passed":true},{"actual":4,"check":"cheap item rises one #1","expected":4,"passed":true},{"actual":850,"check":"crash capped at 15 #1","expected":850,"passed":true},{"actual":118,"check":"control #1","expected":118,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fault site minimum rise step #1\", \"actual\": 100, \"expected\": 100, \"passed\": true}, {\"check\": \"fault site minimum rise step #2\", \"actual\": 51, \"expected\": 51, \"passed\": true}, {\"check\": \"partial repair boundary #1\", \"actual\": 50, \"expected\": 50, \"passed\": true}, {\"check\": \"partial repair boundary #2\", \"actual\": 50, \"expected\": 50, \"passed\": true}, {\"check\": \"no target listed #1\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"cheap item rises one #1\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"crash capped at 15 #1\", \"actual\": 850, \"expected\": 850, \"passed\": true}, {\"check\": \"control #1\", \"actual\": 118, \"expected\": 118, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}