> For the complete documentation index, see [llms.txt](https://edseries-plugins.gitbook.io/p/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://edseries-plugins.gitbook.io/p/eddungeons/extra/cost-types.md).

# Cost Types

### Cost Types

#### 1. Arithmetic Cost (Linear Growth)

**Formula:** `STARTING_COST + LEVEL * INCREASE_COST_BY`

Arithmetic cost increases by a fixed amount each level, creating a linear progression. This results in predictable, steady cost increases.

**Example:**

* Starting Cost: 100
* Increase Cost By: 50
* Level 1: 100 + 1 × 50 = 150
* Level 2: 100 + 2 × 50 = 200
* Level 3: 100 + 3 × 50 = 250

#### 2. Exponential Cost (Exponential Growth)

**Formula:** `STARTING_COST * EXPONENTIAL_GROWTH^LEVEL`

Exponential cost multiplies by a growth factor each level, creating rapid cost acceleration. This creates increasingly expensive upgrades at higher levels.

**Example:**

* Starting Cost: 100
* Exponential Growth: 1.5
* Level 1: 100 × 1.5¹ = 150
* Level 2: 100 × 1.5² = 225
* Level 3: 100 × 1.5³ = 337.5

### Configuration

#### Arithmetic Cost Configuration

```yaml
currency: "coins"           # Currency type to use
starting-cost: 100.0       # Base cost at level 0
increase-cost-by: 50.0     # Amount to add per level
remove-currency: true      # Whether to deduct currency from player
```

#### Exponential Cost Configuration

```yaml
currency: "gems"           # Currency type to use
starting-cost: 100.0       # Base cost at level 0
exponential-growth: 1.5    # Multiplier per level (must be > 1.0)
remove-currency: true      # Whether to deduct currency from player
is-exponential: true       # Set to true for exponential cost
```


---

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