In the basic course you got to know volume as a column beneath the chart: every candle gets a bar showing how much was traded during that time period. That is useful — a breakout with a thick bar is more serious than one with a thin bar. But this time-based volume has a built-in blindness: it answers the question "when was it traded", not "where".
Imagine you are watching a market that oscillates within a narrow range for an entire day. Time-based volume shows you uniformly high bars — but it does not reveal that by far the largest share of trading took place at a single price level in the middle of the range. That very level is the one where buyers and sellers agreed most intensely. It is an anchor, a magnet — and you only see it when you plot volume not over time but over price.
This reversal of the axis is called Volume Profile (or Volume-at-Price). Instead of vertical bars beneath the chart, you draw horizontal bars next to the chart — one per price level. The longer the bar, the more contracts or shares changed hands at exactly that price. A time series becomes a distribution. And distributions tell you where the market has its center of gravity.
VbP, VPVR and VRVP — the same idea, different labels
The platforms name the tool differently, but at their core they all mean the same thing:
- VbP — Volume by Price: The umbrella term. Volume broken down by price levels.
- VPVR — Volume Profile Visible Range: The profile computes exactly over the area you currently see on the screen. Zoom out and the profile changes with it. Handy for quick exploration.
- VRVP / Fixed Range: You manually mark a stretch (such as a rally or a crash), and the profile computes only over this fixed selection — no matter how you zoom afterwards.
The difference between "visible" and "fixed" is not cosmetic: a Visible Range profile is a magnifying glass for the moment, a Fixed Range profile a fixed analysis of a particular market phase. Which one you use when we clarify in Section 4.
The root: Market Profile and Auction Market Theory
Volume Profile did not fall from the sky — it is the modern, volume-based evolution of an idea from the 1980s. The Chicago trader J. Peter Steidlmayer developed the Market Profile at the Chicago Board of Trade. His starting point was a simple yet profound insight: the market is a continuous auction. The price moves up to attract sellers and down to attract buyers — it is constantly searching for the level at which enough counterparty is present to enable trading. This view is called Auction Market Theory.
Steidlmayer did not measure volume per price, but the time per price: how many half-hour periods did the market touch a particular level? He marked each period with a letter — the first half hour with "A", the second with "B", and so on. These letters stacked next to each price into columns. He called this TPO: Time-Price-Opportunity. Each letter is an "opportunity" at which the market offered an actor that price for a certain amount of time.
Why does this origin matter? Because the terms you are about to encounter — Point of Control, Value Area, the letter shapes — are not arbitrary indicator inventions. They are the vocabulary of a well-thought-out theory about how markets function as auction systems. Anyone who reads the profile merely as "colorful bars" gives away the actual message: the market tells you where it feels comfortable and where it flees.