2.2 The Dow Theory
Key Takeaways
- Dow employed the industrial average and the railroad (now transportation) average because production of goods and shipment of goods should confirm each other.
- The closing price is the most important price of the day in Dow Theory; intraday highs and lows are ignored for signals.
- Confirmation requires both averages to make corresponding closing new highs or new lows; a new high in one average without the other is not confirmation.
- The three movements are the primary trend (tide), secondary reaction (wave), and minor movement (ripple), which run at the same time.
- Volume is a confirming factor that typically expands with the primary direction; a Dow Theory line is a sideways pause in an average that still needs confirmation to break.
Dow Theory is the first complete market-analysis framework CMT Level I expects you to operate, not merely name. Charles Dow never packaged it as a manual. William Hamilton and Robert Rhea turned editorials into rules. Those rules still generate exam items because they force a precise vocabulary: which two averages, why both, which price of the day, what confirmation is, and which three movements you are looking at.
The two indexes Dow employed — and why they mattered
Dow worked with:
- The industrial average (today the Dow Jones Industrial Average), representing companies that produce goods.
- The railroad average (today the Dow Jones Transportation Average), representing companies that move goods.
He treated them as one economic circuit. If factories are busy but nothing is shipping, the boom is incomplete. If rails (later trucks and airlines) are booked but industrial stocks lag, demand in the real economy is not confirmed by producers. Confirmation between the two averages was therefore not a charting flourish. It was a test of whether the primary trend reflected genuine business expansion or contraction.
On the exam, "Dow's two indexes" means Industrials and Transports (rails) — not the modern S&P 500 plus Nasdaq, and not a single combined Dow number. Later indexes can be used with a confirmation mindset, but this unit's named pair is the industrial average and the railroad/transportation average.
Why "rails" became "transports"
In Dow's lifetime, railroads were the shipping system that moved U.S. goods. In 1970 the railroad average was reconstituted as a broader Transportation Average so airlines, trucking, and related carriers could sit in the same economic role. The logic did not change: production and distribution should confirm. If a question uses either "railroad average" or "Transportation Average," map it to that second average, not to a utilities index or a bond index.
Basic tenets
Rhea's organization is the version technicians still outline. Learn the tenets as a checklist, then attach the trap that sits under each one.
| Tenet | What it means in practice |
|---|---|
| The averages discount everything | Closing prices already embed news, rumors, and liquidity. The technician reads the averages rather than rebuilding every fundamental from scratch. |
| The market has three movements | A primary trend (tide), secondary reactions (waves), and minor ripples coexist on the same chart. |
| Primary trends have phases | Bull: accumulation, public participation, excess. Bear: distribution, public participation, despair or panic. |
| The averages must confirm | A signal in Industrials is unfinished until Transports make a corresponding closing break — and vice versa. |
| Volume confirms the trend | Volume typically expands with the primary direction and dries up against it. Volume supports price; it does not replace two-average confirmation. |
| A trend continues until a clear reversal | Assume continuation. Non-confirmation is a warning, not an automatic reversal by itself. |
"The averages discount everything" is the ancestor of later claims that price is a sufficient statistic of known information. It does not say surprises cannot arrive. It says the technician starts from the tape, not from a private inventory of facts the market has not yet shown. Acts of God and sudden policy shocks still happen; the averages then reprice, and the technician reads the new closes.
Primary-trend phases keep you from treating every rally as a new era. Early accumulation can look dull. Public participation is the long middle where most trend-followers make money. Excess (or, in bears, despair) is where the last buyers or sellers arrive. Dow Theory does not require you to time those phase labels to the day. It requires you to remember that a primary move is a process, not a single breakout bar.
The most important price of the day: the close
According to Dow Theory, the closing price is the most important price of the day. Intraday highs and lows are ignored for signaling. Hamilton and Rhea required end-of-day closes on the averages.
Why the close? Historically, the close is the price at which newspaper averages were published, at which positions were marked, and at which many discretionary traders accepted the day's verdict. A spike through a prior high at 11:00 a.m. that fails to hold into the close is not a Dow Theory breakout.
Exam application
If a question asks which price Dow Theory treats as decisive, the answer is the close, not the open, not the midpoint, and not the intraday extreme. Intraday charts are useful in other CMT units. They are not how classical Dow Theory dated a confirmation. Volume during the day can still characterize the session, but the signal waits for the close on both averages.
Confirmation — and the Level I trap
Confirmation means both averages print corresponding closing signals:
- A primary bullish confirmation requires both Industrials and Transports to close above the relevant prior secondary-rally highs.
- A primary bearish confirmation requires both to close below the relevant prior secondary-reaction lows.
A new high in one average without the other is not confirmation. That sentence is the exam trap. Divergence, or non-confirmation, is information — it raises the chance that the move is incomplete or failing — but it is not itself the second average's signal. Classical Dow Theory also sets no fixed calendar deadline for the second average to confirm. Confirmation can lag days or longer. Waiting is part of the method.
Volume cannot paper over a missing average. A high-volume industrial breakout that transports refuse to confirm remains non-confirmation.
Lines
A line is a sideways stretch in which an average fluctuates in a relatively narrow range for a period of weeks. Rhea described lines as lasting at least two or three weeks, with swings often on the order of about 5%. A closing break out of a line, confirmed by the other average, can mark accumulation (upside) or distribution (downside). Do not treat a line as merely a modern rectangle pattern name from a later textbook and stop thinking. In Dow Theory, a line is a pause in the average that still needs confirmation to interpret.
Three primary price movements
Dow compared the market to the ocean. Learn the labels and the time horizon, not fake precision of exact days.
| Movement | Ocean metaphor | Typical character | Technician's job |
|---|---|---|---|
| Primary trend | Tide | Months to years; the big bull or bear | Identify it and stay with it until a confirmed reversal |
| Secondary reaction | Wave | Weeks to a few months; often retraces a portion of the prior primary swing | Do not mistake it for a new primary trend |
| Minor movement | Ripple | Days to less than a few weeks | Noise; most easily pushed around; not a Dow Theory signal by itself |
Secondary reactions commonly retrace one-third to two-thirds of the preceding primary swing, but those fractions are descriptive, not a mechanical Fibonacci overlay (Fibonacci is a later unit). The exam wants the three names and the idea that they run at the same time. A secondary decline inside a primary bull is still a bull market until both averages confirm a primary reversal.
Minor movements are where headlines live. Dow Theory's humility is that the tide is read from confirmed closes on both averages, not from a two-day ripple in one index.
Volume as a confirming factor
Volume is the second confirmation, not a substitute for the other average. In a primary advance, volume tends to increase on rallies and contract on declines. In a primary decline, volume tends to increase on selloffs and contract on bounces. Thin volume on a new high is a caution. It is not an independent buy or sell rule in this unit, and it cannot turn a one-average breakout into confirmation.
Putting a session on the chart
Suppose Industrials close at a 12-month high while Transports stall below their last secondary peak. A technician trained in Dow Theory does not announce a confirmed primary bull signal. The correct language is non-confirmation. If Transports later close above that peak while Industrials remain in gear, then confirmation exists. If Industrials fall back and both averages close below prior secondary lows, the primary evidence has shifted the other way.
That is the entire craft of this unit: two averages, closes, both or it is not confirmation, three movements, volume along for the ride, lines as pauses. Master those six phrases and the Level I items in this section become classification problems rather than essays.
According to Dow Theory, which price of the day is treated as the most important for signals?
The industrial average closes at a new high, but the transportation average does not. Under Dow Theory, this is:
Which list correctly names the three primary price movements in Dow Theory?