# forge.ta.bw_mfi

```python
forge.ta.bw_mfi(high: ArrayLike, low: ArrayLike, volume: ArrayLike) -> dict[str, np.ndarray]
```

Market facilitation index: ``mfi = (high - low) / volume``, in price units.

NaN where the volume is 0 or a price is missing. ``phase`` is MetaTrader 5's colour: 0 green
(MFI up, volume up), 1 fade (down, down), 2 fake (MFI up, volume down), 3 squat (MFI down,
volume up). The two directions start up and change only on a strict change from the previous
bar; a bar with no MFI leaves them as they were and has no phase, and neither does bar 0.

Since Forge API 1.