What it is

Accumulation is sustained buying - often by large, patient participants - that builds positions gradually so as not to spook the market. Distribution is the opposite: steady selling that unloads positions without crashing the price. Both can happen while the chart looks calm, which is exactly why volume-based money-flow tools exist: they try to reveal whether the net pressure under a quiet surface is buying or selling.

Money flow is the umbrella idea: weight each period's volume by where price closed within its range (and sometimes by the price level), then accumulate it over time. The running total rises when buyers dominate and falls when sellers do, giving you a single line that summarises participation pressure.

How it works

Most money-flow tools share a common recipe:

1. Locate the close within the period's range. A close near the high implies buyers controlled the period; a close near the low implies sellers did. This produces a multiplier, often between -1 and +1.
2. Weight by volume. Multiply that location factor by the period's volume, so heavily-traded periods count more.
3. Accumulate. Add each period's weighted result to a running total. The slope and direction of that total are what you read.

The Accumulation/Distribution Line (A/D Line) is the classic example: a close in the upper part of the range with high volume adds a lot; a close in the lower part subtracts. Other variants such as the Money Flow Index incorporate price levels and cap the result on a 0-100 scale, but the spirit is the same - turn volume into a directional pressure gauge.

How to use it

The headline use is divergence between the money-flow line and price, which can hint that the visible trend is not as healthy as it looks.

• Bullish divergence: price makes a lower low, but the A/D Line makes a higher low. Selling pressure is drying up beneath a falling price - possible quiet accumulation.
• Bearish divergence: price makes a higher high, but the money-flow line makes a lower high. The rally is being sold into - possible distribution.
• Confirmation: when the line rises alongside price, the trend is backed by participation; when both fall together, the decline is genuine.

A checklist for reading money flow

1. First establish the price trend and structure - money flow is a supporting read, never the lead.
2. Check whether the money-flow line is making the same highs and lows as price (confirmation) or different ones (divergence).
3. Treat divergence as a warning to tighten attention, not an instant reversal signal - divergences can persist for a long time.
4. Demand a price-based trigger (a broken level, a structure shift) before acting on what the flow line hints at.
5. Sanity-check against the event calendar so a one-off volume burst does not distort the line.

Key takeaway: Money-flow tools weight volume by where price closes in its range and accumulate it, turning quiet buying or selling into a readable line. Their best use is spotting divergence from price - a warning to investigate, confirmed only by price action itself.

Strengths & limits

Accumulation/distribution tools add a dimension price alone cannot: they hint at the intent behind the trade by combining where price closed with how much traded. They are especially useful for catching exhaustion or stealth positioning before it shows up cleanly in price.

The limits are real. These are still indirect inferences - no indicator can truly see who is buying. Different formulas weight things differently, so two "money-flow" tools can disagree. Divergences are notorious for appearing early and lasting far longer than expected, so trading them mechanically leads to premature entries. Use them as context that raises or lowers your confidence in a price signal, not as triggers in their own right.