# Money Flow Index

## Overview of MFI

The Money Flow Index (MFI) is a technical oscillator designed by Quong and Avrum Soudack to identify overbought or oversold signals in an asset using price and volume data. This concept is similar to Mark Chaikin’s Chaikin Money Flow (CMF) indicator, which also uses price and volume information to measure money flow into and out of an asset over a specified period.

While both MFI and CMF aim to assess the market sentiment, their calculation methods differ. The oscillator ranges between 0 and 100 for the MFI, with readings above 80 considered overbought and below 20 considered oversold. Some traders use more extreme thresholds of 90 and 10 to identify overbought and oversold conditions, respectively. Unlike traditional oscillators such as the Relative Strength Index (RSI), the MFI incorporates volume data and price, leading some analysts to refer to it as the volume-weighted RSI.

On the other hand, the Chaikin Money Flow (CMF) is calculated by comparing the closing price of an asset to its high and low prices while incorporating volume data. The CMF ranges between -1 and 1, with positive values indicating buying pressure and negative values suggesting selling pressure. Traders often use the CMF in conjunction with other technical indicators or chart patterns to confirm trends or potential reversals.

## How to Calculate MFI

To calculate the Money Flow Index, follow these four steps:

### 1. Typical Price

Compute the typical price for each period by summing the high, low, and close prices and dividing the result by three.

`Typical Price = (High + Low + Close) / 3`

### 2. Money Flow

Calculate the money flow by multiplying the typical price by the volume for that period.

`Money Flow = Typical Price × Volume`

### 3. Money Ratio

Determine the money ratio by dividing the positive and negative money flows. Positive money flow is the sum of money flows for periods where the typical price is higher than the previous period’s typical price, while negative money flow is the sum of money flows for periods where the typical price is lower than the previous period’s typical price.

`Money Ratio = Positive Money Flow / Negative Money Flow`

### 4. Money Flow Index

Finally, calculate the Money Flow Index using the following formula:

`MFI = 100 - (100 / (1 + Money Ratio))`

## Example scanners based on Money Flow Index

The Money Flow Index can be used in Scanning the market. To see how exactly it can be used in this way, we provide the following samples. Both scanners search the market for stocks using this indicator.

## Interpretation of MFI

### Overbought and Oversold

As mentioned earlier, MFI readings above 80 (or 90) indicate overbought conditions, suggesting that the asset may be overvalued and due for a price correction. Conversely, readings below 20 (or 10) signal oversold conditions, implying that the asset may be undervalued and poised for a price rebound.

### Divergences

Divergences between the MFI and the asset’s price can signal potential trend reversals. For instance, if the MFI is rising while the price is falling or flat, the price could start to increase. Conversely, if the MFI is dropping while the price is rising or flat, the price could decline.

## Practical Applications

### Identifying Reversals

Traders can use MFI divergences to identify potential trend reversals. For example, a bullish divergence occurs when the price makes a lower low, but the MFI makes a higher low. This indicates that selling pressure is weakening, and a reversal to the upside could be imminent. On the other hand, a bearish divergence occurs when the price reaches a higher high, but the MFI forms a lower high. This suggests that buying pressure is diminishing, and a reversal to the downside may be forthcoming.

MFI can also be used to confirm existing trends. When the MFI is above 50, it suggests that the prevailing trend is bullish, as there is more positive money flow than negative money flow. Conversely, the trend is bearish when the MFI is below 50, with more negative than positive money flow. Traders can use these readings to enter or exit positions in the direction of the prevailing trend.

## Limitations and Considerations

While the Money Flow Index is a valuable tool for analyzing market conditions, it is essential to consider its limitations. MFI may generate false signals or lag behind price movements like any technical indicator. Additionally, the MFI may remain in overbought or oversold territory for extended periods during strongly trending markets, leading to missed opportunities or premature exits. As a result, traders should use the MFI in conjunction with other technical indicators and chart patterns to improve the accuracy of their analysis and decision-making.

## Example strategy based on Money Flow Index

The Money Flow Index can be used in Testing Strategies. To see how exactly it can be used in this way, we provide the following sample. The strategy tests buying and selling rules built around this indicator.

## The bottom line

The Money Flow Index (MFI) is a versatile technical oscillator that provides insights into overbought or oversold conditions by incorporating price and volume data. It can help traders identify potential trend reversals and confirm existing trends, enhancing their overall market analysis. However, like any technical tool, the MFI has limitations and should be combined with other indicators and techniques to ensure more accurate and well-informed trading decisions.

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