Money Flow
Lexicon Core Definition
Money flow, in the context of technical indicators, is the product of the typical price and trading volume for a given bar, used to measure the dollar value of market activity flowing into or out of an asset.
Analysis Breakdown
Frequent Queries
How is money flow different from simply looking at trading volume?
Volume measures how many units of an asset were traded during a period without reference to where the price closed within its range. Money flow combines volume with the typical price, producing a dollar-value figure that reflects both the quantity of activity and the price level at which that activity occurred. A high-volume bar at a low typical price generates a different money flow value than the same volume at a high typical price. This price-weighting means money flow captures the directional quality of volume activity rather than just its raw quantity, providing a more nuanced view of market participation.
Why is money flow classified as either entirely positive or entirely negative per bar?
The positive or negative classification of a bar's entire money flow is a simplifying convention rather than a literal representation of all transactions. In reality, every bar contains both buying and selling activity. The convention assigns the full bar's money flow to the direction indicated by the typical price comparison — up means positive, down means negative — because this directional signal reflects the net outcome of all that period's activity. While this binary classification is imperfect, it provides a practical, computable framework for aggregating directional volume pressure across multiple bars without requiring transaction-level data unavailable to most traders.
Do I need to understand money flow calculation to use the Money Flow Index effectively?
Understanding money flow's underlying calculation significantly improves MFI interpretation. Without this foundation, the MFI appears similar to RSI with an extra input. Knowing that MFI is built on dollar-volume flow rather than simple price change magnitude explains why it can diverge from RSI: when price rises but volume is declining, money flow weakens even as price momentum appears intact. This understanding makes divergence signals between price and MFI more meaningful — they are not just oscillator anomalies but direct evidence of declining capital commitment behind a price move, which is a stronger and more specific analytical observation.
Calibration Check
Money flow and cash flow are the same concept applied to trading
Cash flow is a financial accounting concept measuring the movement of actual funds into and out of a business over a period. Money flow, in technical analysis, is a mathematical calculation — typical price multiplied by volume — used to weight trading activity by both price level and participation magnitude. The two concepts share directional language but are entirely unrelated in their calculation, source data, and analytical purpose. Money flow does not represent actual cash entering or leaving any entity; it is a synthetic indicator input designed to proxy the dollar value of market activity for momentum analysis purposes.
Positive money flow means institutional buyers are actively accumulating the asset
Positive money flow indicates that the typical price for a given bar was higher than the previous bar's typical price, and that this upward movement was accompanied by trading volume. It does not confirm the identity of market participants or verify institutional intent. High positive money flow may reflect retail-driven activity, algorithmic trading, or institutional accumulation — the calculation cannot distinguish between these sources. Traders who interpret positive money flow as confirmed institutional buying are drawing a conclusion that the data does not directly support. Volume pattern analysis provides context for participation but does not reveal participant identity.
Money flow is a standalone trading indicator that can be plotted and read directly
Raw money flow values are typically very large numbers in dollar terms — the product of typical price and volume — and are not normalised or scaled for direct comparison across different time periods or market conditions. They cannot be read against fixed thresholds the way RSI or MFI can. Raw money flow serves as an intermediate calculation input for normalised indicators like the Money Flow Index rather than as a directly plotted trading signal. Traders who want to apply money flow analysis in practice should use MFI or other normalised volume-weighted indicators that transform raw money flow into interpretable, threshold-based readings.