Dow theory explained simply: a market is in an uptrend while its highs and lows keep rising, and in a downtrend while they keep falling, and that trend is assumed to continue until price clearly shows otherwise. The ideas come from Charles Dow’s newspaper editorials more than a century ago, and most of what price action traders call market structure grew from them.
Quick answer: what is Dow theory?
Dow theory is a way of reading trends built from Charles Dow’s Wall Street Journal editorials. It says markets move in three trends at once (primary, secondary and minor), that a bull market makes higher highs and a bear market lower lows, and that a trend holds until a clear reversal. It is useful for context but slow for timing.
Where Dow theory came from
Charles Dow co-founded Dow Jones and Company and was the first editor of the Wall Street Journal. He built stock averages, including one for industrial companies and one for railroads, to track the health of the economy through the market.
Dow never published a book called Dow theory. According to a CFA Institute Research Foundation review of technical analysis, his ideas lived in his editorials. His successor at the paper, William Peter Hamilton, carried them on, and Robert Rhea later collected both men’s editorials into one volume.
The same review quotes a January 1902 editorial in which Dow described a bull period as one where each high point exceeds the previous ones, and a bear period as one where the low point is lower than the previous lows. Dow died later that year, in December 1902.
The six tenets in plain English
Later writers organised Dow’s ideas into six principles. The wording varies between textbooks, but the content is broadly the same.
- The averages discount everything. Known news is already reflected in price.
- The market has three trends. Primary, secondary and minor moves run at the same time.
- Primary trends have phases. Usually described as accumulation, public participation and distribution.
- The averages must confirm each other. A trend in industrials was trusted more when the transport average agreed.
- Volume should confirm the trend. Activity should expand in the direction of the main move.
- A trend continues until a clear reversal. The default is that the trend is still in place.
Primary, secondary and minor trends
This is the part of Dow theory we use most, because it maps directly onto how we read several timeframes at once.
| Trend | Typical description | Modern equivalent |
|---|---|---|
| Primary | The main move, often lasting months to years | Weekly and daily structure |
| Secondary | A correction against the primary trend | Daily or 4-hour pullback |
| Minor | Short swings inside the correction | Hourly and lower charts |
The durations are guidelines, not rules, and different authors quote different ranges. The practical lesson is the hierarchy: a minor swing against the primary trend is usually noise. Our guide to reading several timeframes top-down applies the same idea.
Dow theory trends and modern market structure
Dow’s definition of a bull period is the same higher highs and higher lows that we teach in our guide to identifying market structure. A downtrend is the reverse: lower highs and lower lows.
The confirmation tenet outside shares
Spot forex and single commodities have no second average to confirm against. Some traders use a related market instead, such as two correlated currency pairs, which our article on correlation in forex trading explains. We treat that as a loose cross-check, not a rule.
Volume where it exists
On shares and futures, rising volume in the trend direction is a useful clue. Our guide on using volume to confirm a trend covers what to look for and why tick volume in forex is weaker evidence.
What the evidence says, and the limits
The research is mixed. The CFA Institute review notes that Alfred Cowles studied Hamilton’s editorials in the 1930s and found the strategy would have earned less than buy-and-hold. A 1998 Journal of Finance paper by Brown, Goetzmann and Kumar revisited that work and concluded the calls produced higher risk-adjusted returns.
Those studies tested one man’s judgement on one stock market a century ago, so they are not evidence that the theory works today. In our experience the limits are clear:
- It is slow. The review notes that Dow theory only gives its calls once a trend is well under way, so part of every move is missed.
- It is subjective. Telling a deep secondary correction from a new primary trend is often only obvious afterwards.
- The averages have changed. Railroads no longer play the role they did, and the transport average now covers a different economy.
- It says nothing about entries, stops or size. It is a framework for context, not a trading plan.
Worked example: reading a hypothetical uptrend
All figures are hypothetical. An index on the daily chart has made swing lows at 7,100, 7,250 and 7,380, with highs at 7,400, 7,550 and 7,700, so the primary trend is up.
- Secondary move: price pulls back from 7,700 to 7,520 over two weeks, which stays above the last swing low at 7,380.
- Minor swings: on the hourly chart the pullback is choppy, and we ignore those swings for direction.
- Reversal test: a close below 7,380 followed by a lower high would suggest the primary trend may be turning.
- Risk: on a £5,000 account at 1% risk, £50 is the most we lose if we buy at 7,540 with a stop at 7,490, so about £1 per point on a spread bet.
Spread bets and CFDs are leveraged, so losses can exceed what the example suggests in a fast market. Our trend following strategy rules cover how to manage a position once the trend is confirmed, and our guide to spotting the start of a new trend covers the earlier, riskier entries Dow theory tends to miss.
Common mistakes with Dow theory
- Trading every minor swing. In Dow theory, minor swings are the least meaningful part of the market.
- Calling a reversal too early. One lower high inside a correction is not a new bear market.
- Treating it as a complete method. It tells you the direction of the tide, not where to enter or how much to risk.
- Drawing structure inconsistently. Pick a rule for what counts as a swing and stick to it; our guide on how to draw trendlines has the same advice.
Frequently asked questions
Did Charles Dow call it Dow theory?
No. Dow set out his ideas in Wall Street Journal editorials, and the name and formal tenets came from later writers. William Peter Hamilton and Robert Rhea did most to organise them.
Does Dow theory still work today?
Its core idea, that trends are defined by rising or falling highs and lows, is still the basis of market structure analysis. The confirmation and volume tenets are harder to apply, and the evidence on its timing calls is mixed.
How long does a secondary trend last?
Textbooks quote different ranges, commonly from a few weeks to a few months. Treat any number as a rough guide and judge the correction by structure instead.
Can Dow theory be used in forex?
The three-trend idea and the definition of a trend work on any chart. The confirmation tenet needs adapting, for example by checking a correlated market.
Next steps
If Dow’s trend definition makes sense, the next step is learning to read it candle by candle, which our complete guide to price action trading walks through.
Discovering the beginning of new trends and our filters and trigger process are both part of our price action trading course, and the basics section is free to start.
This article is for education only and is not financial advice. Trading leveraged products such as CFDs and spread bets carries a high risk of losing money.
