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lib/oscillators/marketfi/Marketfi.md
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# MARKETFI: Market Facilitation Index
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Oscillator |
| **Inputs** | OHLCV bar (TBar) |
| **Parameters** | None |
| **Outputs** | Single series (MARKETFI) |
| **Output range** | Varies (see docs) |
| **Warmup** | `> 1` bars |
### TL;DR
- The Market Facilitation Index answers a single question with arithmetic directness: how much price moved per unit of volume traded?
- No configurable parameters; computation is stateless per bar.
- Output range: Varies (see docs).
- Requires `> 1` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "Price moves in an empty room; volume tells you how many people showed up."
The Market Facilitation Index answers a single question with arithmetic directness: how much price moved per unit of volume traded? One division. No lookback period. No smoothing. No parameter to debate. What you get is raw market efficiency — the price range a market delivers for each unit of liquidity consumed.