neon-sprawl/docs/decomposition/modules/E3_M5_EconomyBalancePolicy.md

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# E3.M5 — EconomyBalancePolicy
## Summary
| Field | Value |
|--------|--------|
| **Module ID** | E3.M5 |
| **Epic** | [Epic 3 — Crafting Economy](../epics/epic_03_crafting_economy.md) |
| **Stage target** | Pre-production |
| **Status** | Planned (see [dependency register](module_dependency_register.md)) |
## Purpose
Faucet/sink parameter sets and guardrails for inflation/deflation; feeds alerts via [E9.M2](E9_M2_KpiDashboardsAndAlerting.md).
## Responsibilities
- Encode `EconomyPolicy`, `PriceBandRule`, `FaucetSinkRatio` thresholds; integrate with [E3.M4](E3_M4_SinkAndDurabilityLifecycle.md) sinks.
## Key contracts
| Contract | Role |
|----------|------|
| `EconomyPolicy` | Named tunable bundles. |
| `PriceBandRule` | Listing/fee bands for [E8.M3](E8_M3_PlayerTradeAndMarketplace.md). |
| `FaucetSinkRatio` | KPI targets and breach signals. |
## Module dependencies
- **E3.M4** — SinkAndDurabilityLifecycle.
- **E9.M2** — KpiDashboardsAndAlerting.
## Dependents (by design)
- **E8.M3** — marketplace fees and validation.
- **E9.M3** — LiveBalanceControlPlane.
## Related implementation slices
Epic 3 **Slice 4** — policy alerts on ratio breaches.
## Source anchors
- Master plan: [`neon_sprawl_vision.plan.md`](../../../neon_sprawl_vision.plan.md) — Epic 3.
- [Module dependency register](module_dependency_register.md)