Volume spread analysis: what it actually reads

Where it comes from

The roots are in the 1930s, when Richard Wyckoff wrote down how large operators accumulate and distribute positions and how that shows on the tape. Decades later Tom Williams, a former syndicate trader, tightened the idea into a bar by bar method and called it volume spread analysis. Nothing about it needs a computer. It was built for people reading printed charts with a volume histogram underneath, which is why every example in this course is drawn exactly that way.

The central belief is simple and, to be fair, unprovable in the strict sense: markets move when large participants act, and large participants cannot act without leaving volume behind. You cannot see their orders. You can see the volume their orders create and the price result it did or did not produce.

The three laws

VSA rests on three ideas Wyckoff described and Williams kept.

• Supply and demand. Price rises when demand exceeds supply and falls when supply exceeds demand. Obvious, but the useful version is the negative one: price stops rising when demand runs out, not when supply arrives. The end of a move is usually an absence, not an ambush.
• Cause and effect. The size of a move is proportional to the preparation behind it. A base that took forty bars to build supports a longer markup than one that took six. This is the argument for reading background before bars, which part 3 makes in full.
• Effort and result. Volume is the effort. Spread and close are the result. When heavy effort produces a small result, something absorbed it. When light effort produces a large result, nothing stood in the way. We wrote a separate piece on effort versus result as a standalone tool; in VSA it is the engine under every reading.

The one comparison

Here are two rallies. The candles are the same. Cover the volume pane and you could not tell them apart.

Rally A prints rising volume as price rises: each step up attracted more participation than the last. Demand is still arriving. Rally B prints falling volume as price rises: each step up attracted fewer participants. Price is drifting on thinning conviction, and the next real seller will find nobody underneath.

That is the whole method in one picture. Every VSA event you will learn in parts 4 to 6 is a special case of this comparison, applied to a single bar or a short sequence.

What VSA is not

It is not an indicator, and the various volume oscillators sold as VSA tools add nothing the raw histogram does not already show. It is not a prediction engine; a selling climax says the decline met buyers, not that a rally must follow. And it is not a substitute for structure. A test on low volume in the middle of nowhere is a curiosity. The same test at a demand zone that price returned to after a break of structure is a trade.

One more honesty point, because this site tries to keep to them. We measured whether volume alone predicts direction on gold across years of data and it does not; the write up is in participation is not direction. What it does measure is participation, and participation is what VSA reads. Keep the distinction and the method stays useful.

The vocabulary you need

Before part 2, make sure these words mean something specific to you.

• Spread. The range of a bar, high minus low. Wide, average or narrow relative to recent bars.
• Close position. Where the close sits inside the spread: on the high, in the middle, or on the low.
• Relative volume. This bar's volume against the last ten to twenty bars: ultra high, high, average, low.
• Background. The phase and trend the bar sits in. Markdown, accumulation, markup, distribution.
• Strength and weakness. Strength is evidence that supply has been absorbed. Weakness is evidence that demand has been met. Strength appears on down bars; weakness appears on up bars. That inversion trips everyone once.

Course navigation. Course index: VSA course for gold. Next: Part 2, Reading one bar.