Ducklings Game Simulation Variables Index
## Overview
The simulation uses a **three-tier configuration system**:
- **Tier 1: World** - Global constraints outside Canada's control
- **Tier 2: Administration** - Multi-year government policy (4-5 year term)
- **Tier 3: Year** - Fiscal year-specific values
Later tiers override earlier ones. Access via `GameConfigService::get('path.to.value')`.
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