# Dependency Graphs

> How Fusion's cached balance dependency graph works and when to configure it for a market.

Dependency graphs in IPOR Fusion are a mechanism that defines relationships between markets where one market's balance calculation depends on another market's balance. They ensure accurate asset valuation and prevent double-counting when markets have nested or interconnected positions.

### Purpose

Dependency graphs serve three critical purposes in Fusion:

1. **Prevent Asset Double-Counting**: When a market holds assets that are themselves tracked in another market (e.g., LP tokens staked in a gauge), dependency graphs ensure the underlying assets aren't counted twice in `totalAssets()` .
2. **Ensure Atomic Balance Updates**: When a market balance changes, all dependent markets are automatically updated to maintain consistency across the vault's accounting system.
3. **Support Complex Market Relationships**: Enable sophisticated DeFi strategies where positions span multiple protocols (e.g., lending markets depending on underlying asset markets, or LP token markets depending on constituent tokens).

### Implementation

The dependency graph system is implemented through:

- **Storage Structure**: A mapping from each market ID to an array of dependent market IDs.
- **Configuration Functions**: `updateDependencyBalanceGraphs()` for setting up relationships.
- **Query Functions**: `getDependencyBalanceGraph()` for retrieving dependencies.