What Dow theory is
Dow theory is a set of ideas about how market trends form and end. It comes from the editorials of Charles Dow, founder of the Wall Street Journal. Later writers organised his ideas into a formal method. Much of modern technical analysis uses its concepts, including higher highs and higher lows, trend phases and volume confirmation.
The theory was built for US stock averages, mainly the Dow Jones Industrial Average and the Dow Jones Transportation Average. Traders now apply its trend rules to currencies, metals and indices such as US30 (Dow Jones).
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The principles of Dow theory
The theory is usually summarised in the following tenets.
- The averages discount everything. Prices already reflect known information, including earnings, interest rates and sentiment. Unexpected events are absorbed as they happen.
- The market has trends of different lengths. The primary trend is the main move and lasts the longest. Secondary trends are corrections against it. Minor trends are short swings inside the secondary moves.
- Primary trends move through phases. In an uptrend these are accumulation (informed buyers enter quietly), public participation (the move becomes obvious and broad) and distribution (early buyers sell to late arrivals). A downtrend runs through the mirror image of these phases.
- The averages must confirm each other. A primary trend signal in the industrial average counts only when the transportation average gives the same signal. The logic is that if factories produce more, transport firms should carry more.
- Volume should confirm the trend. Volume should rise when price moves in the direction of the primary trend and fall during corrections.
- A trend stays in effect until a clear reversal signal appears. You do not assume a trend has ended because it looks stretched. You wait for the price structure to break.
The Dow theory trend: primary and secondary moves
In Dow theory, an uptrend is a series of higher highs and higher lows. A downtrend is a series of lower highs and lower lows. This is the same structure covered in market trends and market structure.
A secondary trend is a pullback or retracement inside the primary trend. Dow writers described it as giving back a meaningful part of the previous primary swing. The hard part is telling a deep secondary correction from the start of a new primary trend. Price behaves the same way at first in both cases.
A drawn example chart
The sketch below is illustrative only. It shows no real market and no live prices.
| Point | What it is | Dow theory reading |
|---|---|---|
| A to C | Higher high | Primary uptrend in progress |
| B to D | Higher low | Uptrend structure intact |
| D to E | Advance to a new high | Trend continues; volume should rise here |
| F | Low above D | Secondary correction, primary trend still up |
| G | High below E | Warning: first failure to make a higher high |
| H | Break below F | Reversal signal: lower high and lower low |
In the full method, the break at H would need the same pattern on the second average before it counts as a confirmed primary reversal. Without that, it is only a signal on one chart.
Confirmation by the averages
Confirmation is the part of Dow theory that is most often skipped. When one average makes a new high and the other does not, Dow followers call it a non-confirmation. They treat the existing trend as weaker, though not yet reversed.
Traders adapt this idea outside stocks. Examples include comparing related currency pairs or checking the same market on several timeframes (see multiple timeframe analysis). These are adaptations, not the original theory. The economic link that tied industry to transport does not always exist between two currency pairs.
For volume confirmation in forex, note that spot currencies have no central exchange. Platform volume is usually tick volume, which counts price changes rather than traded size. See volume indicators and On-Balance Volume for how this works.
Where Dow theory fails
- It is late by design. The method waits for a structural break, so it gives back a large part of a move before it signals a reversal.
- Swing points are subjective. Two traders can mark different highs and lows on the same chart and reach different conclusions.
- Primary and secondary moves are hard to separate in real time. You usually only know which one it was afterwards.
- Ranges produce whipsaws. In sideways markets, price makes small breaks back and forth that look like signals and then fail. Read breakouts and false breakouts on this.
- The averages can diverge for structural reasons. The economy changes, and the two indices may no longer move together as the theory expects.
- Gaps and news jumps can skip the levels you planned around.
Dow theory describes trend structure. It does not tell you what will happen next, and it does not decide position size or exits. Leveraged CFD and forex trading can lose money fast, even when the trend reading is correct. Plan stops and position size first, as covered in risk management.
How it connects to other methods
The Elliott Wave theory and the Wyckoff method both build on Dow's ideas about phases and trend structure. Support and resistance and trendlines give practical ways to mark the swing points Dow theory relies on.
Frequently asked questions
Is Dow theory still used today?
Yes, mostly through its concepts: higher highs and lows, trend phases and confirmation. Few traders follow the original rules in full.
Can Dow theory be applied to forex?
The trend structure rules work on any chart. The confirmation between averages and the volume rule do not transfer directly, because forex has no matching pair of averages and platform volume is usually tick volume.
What is the difference between a primary and a secondary trend?
The primary trend is the main, longest move. A secondary trend is a correction against it that retraces part of the previous swing.
Does Dow theory give entry signals?
It identifies when a trend is in place or has reversed. It is not a complete trading system, and its signals come late and can fail.
What is a non-confirmation?
It is when one average makes a new high or low and the related average does not. Dow followers read it as a sign the trend is weakening.