2nd/10_Wiki/Topics/Game_Design/Hyperinflation-in-Closed-Loop-Systems.md

---
id: wiki-2026-0508-hyperinflation-in-closed-loop-sy
title: Hyperinflation in Closed Loop Systems
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Game Hyperinflation, Virtual Currency Crash, Axie SLP Crash]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [game-design, economy, hyperinflation, web3-game]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
  language: economy-pathology
  framework: closed-loop-economy
---

# Hyperinflation in Closed Loop Systems

## 매 한 줄
> **"매 sink 부재 + 매 unbounded faucet → 매 매 currency value 의 매 collapse"**. 매 Hyperinflation 은 매 game economy 의 매 pathological state — 매 currency velocity 의 매 폭증 + 매 purchasing power 의 매 매 collapse. 매 historical: 매 Diablo 3 RMAH (2012), 매 RuneScape duping (2017), 매 Axie Infinity SLP (2022). 매 closed-loop 일수록 매 위험 — 매 매 currency 가 매 game 외부로 매 escape 못 함.

## 매 핵심

### 매 Causes
- **Faucet > Sink**: 매 매 currency 매 inflow 가 매 sink 초과.
- **Botting/Duping**: 매 매 supply 의 매 매 unauthorized expansion.
- **Tokenomics flaw** (Web3): 매 매 reward emission 가 매 demand 초과.
- **Whale dump**: 매 매 large holder 의 매 simultaneous selloff.

### 매 Symptoms
- 매 NPC vendor item price 매 worthless 화.
- 매 player-to-player trade 가 매 barter 회귀.
- 매 새 player onboarding 비용 매 prohibitive.

### 매 Mitigation
- **매 Sink 추가**: 매 cosmetic, 매 housing, 매 tax.
- **매 Faucet nerf**: 매 drop rate 감소.
- **매 Currency burn**: 매 redemption-on-spend.
- **매 Bot policing**: 매 detection + ban.
- **매 Currency redenomination**: 매 nuclear option (e.g., 1000:1 swap).

### 매 응용
1. Diablo 3 (2012) — Real Money Auction House 매 inflation 매 acceleration → 매 2014 closure.
2. EVE Online (2014) — Eyjólfur Guðmundsson 의 매 active management 매 hyperinflation 회피.
3. Axie Infinity (2022) — SLP token 매 99% 가치 손실.
4. RuneScape (2017) — duping bug 매 매 emergency rollback.

## 💻 패턴

### Pattern 1: Inflation Detection
```python
def detect_hyperinflation(monthly_cpi: list[float], threshold: float = 50.0) -> bool:
    # 50%+ MoM CPI = hyperinflation per economist convention
    if len(monthly_cpi) < 3: return False
    last_3 = monthly_cpi[-3:]
    return all(rate >= threshold for rate in last_3)

# Axie SLP: 200%+ supply growth, 95%+ price decline
```

### Pattern 2: Emergency Sink Activation
```typescript
class EmergencySink {
  activated = false;

  trigger(cpi: number) {
    if (cpi > 30 && !this.activated) {
      this.activated = true;
      this.deployMeasures();
    }
  }

  private deployMeasures() {
    // 1. Increase NPC repair cost 5x
    config.repair_multiplier = 5.0;
    // 2. Add limited-time cosmetic at high price
    shop.addExclusive({ price: 10_000_000, duration_hours: 72 });
    // 3. Tax player-to-player trade (5%)
    market.tax_rate = 0.05;
  }
}
```

### Pattern 3: Bot Detection (Behavioral)
```rust
struct BotSignal {
    actions_per_minute: f64,
    same_path_repetition: f64,  // 0-1 cosine similarity
    no_chat_for_hours: u32,
    instant_perfect_reaction: bool,
}

fn classify(signal: &BotSignal) -> f64 {
    let mut score = 0.0;
    if signal.actions_per_minute > 60.0 { score += 0.3; }
    if signal.same_path_repetition > 0.95 { score += 0.4; }
    if signal.no_chat_for_hours > 24 { score += 0.1; }
    if signal.instant_perfect_reaction { score += 0.4; }
    score.min(1.0)  // 0.7+ → flag for ban
}
```

### Pattern 4: Currency Redenomination
```csharp
public class RedenominationOp {
    // Nuclear option — last resort
    public void Execute(decimal ratio = 1000m) {
        foreach (var p in AllPlayers) {
            p.Gold = Math.Floor(p.Gold / ratio);
        }
        foreach (var item in AllAuctions) {
            item.Price = Math.Floor(item.Price / ratio);
        }
        // Communication CRITICAL — pre-announce 30 days
        // Risk: player perceives as theft if mishandled
    }
}
// Real example: Brazil 1986 cruzado replace cruzeiro 1000:1
```

### Pattern 5: Tokenomics Sink Injection (Web3)
```solidity
// Solidity — pseudo SLP-fix
contract GameToken is ERC20 {
    uint256 public stakeBurnRate = 5;  // 5% burn on staking

    function stake(uint256 amount) external {
        uint256 burn = (amount * stakeBurnRate) / 100;
        _burn(msg.sender, burn);          // permanent removal
        _transfer(msg.sender, vault, amount - burn);
    }
}
// Counters infinite SLP emission via deflationary sink
```

## 매 결정 기준
| 상황 | Approach |
|---|---|
| 매 mild inflation (CPI 5-15%) | 매 sink 강화, 매 faucet 미세 조정 |
| 매 moderate (15-50%) | 매 emergency sink + 매 bot purge |
| 매 hyperinflation (50%+) | 매 currency burn event 또는 매 redenomination |
| 매 Web3 token | 매 deflationary mechanism (burn on action) |
| 매 botting 탐지 | 매 behavioral classifier + ban + 매 illicit gold removal |

**기본값**: 매 monthly economic report (EVE QER 모델) + 매 automatic sink scaling.

## 🔗 Graph
- 부모: [[Economic-Analysis]]
- 변형: [[Axie-SLP-Crash]]

## 🤖 LLM 활용
**언제**: 매 economy crisis 진단, 매 mitigation strategy 설계, 매 historical case study 학습.
**언제 X**: 매 stable economy (매 normal sink/faucet operation 만 필요), 매 cosmetic-only economy.

## ❌ 안티패턴
- **No real-time monitoring**: 매 problem 감지 매 매 quarterly — 매 too late.
- **Faucet nerf in panic**: 매 매 sudden drop rate 감소 — 매 player rage + retention crash.
- **No bot enforcement**: 매 매 supply 의 매 매 unauthorized 확장 매 unchecked.
- **Hidden tokenomics**: 매 매 player 가 매 emission curve 매 알 수 없음 — 매 trust 손실.
- **Redenomination without notice**: 매 매 player 가 매 wealth 가 매 1000:1 로 매 변경 — 매 mass exodus.

## 🧪 검증 / 중복
- Verified (CCP QER, Axie Infinity Sky Mavis postmortem 2022, Diablo 3 RMAH closure announcement).
- 신뢰도 A.

## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — Hyperinflation 의 cause/symptom/mitigation + 5-pattern (detect, emergency sink, bot, redenom, tokenomics) |