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+# Production Chains
+
+Production chains define how raw materials are processed into finished goods.
+
+## Chains
+
+### Basic Chains (Tier I)
+- [Timber Chain](./timber.md) - Woodcutter -> Sawmill -> Timber
+- [Tier I Food Chain](./tier-i-food.md) - Fish and Porridge production
+- [Porridge Chain](./porridge.md) - Oat Farm -> Porridge Stand
+- [Tunics Chain](./tunics.md) - Hemp Farm -> Spinner
+
+### Intermediate Chains (Tier II)
+- [Bread Chain](./bread.md) - Wheat -> Flour -> Bread
+
+## Understanding Ratios
+
+Production chains work best when buildings are matched by their cycle times:
+- **Same cycle time:** 1:1 ratio (e.g., Woodcutter 30s : Sawmill 30s)
+- **Different cycle times:** Calculate based on output/input rates
+- **Bottlenecks:** Usually at raw material gathering or logistics
+
+## Common Issues
+
+1. **Transport delays:** Long distances between buildings reduce effective throughput
+2. **Storage overflow:** Downstream buildings can't keep up
+3. **Resource starvation:** Upstream buildings can't supply enough