The **Marginal Number of Fills** is the increase in the Number of Fills resulting from the stocking one additional unit.

# Example

The **Number of Fills** at a stocking level of 10 units is `5.2`

.

The **Number of Fills** at a stocking level of 11 units is `6.1`

.

The **Marginal Number of Fills** is `0.9`

.