Dow Theory is a financial theory that provides a framework for understanding market trends. It was developed by Charles Dow, co-founder of the Dow Jones & Company, and is fundamental to technical analysis. Here's a brief explanation of its key components:
1. Market Trends
Primary Trend: Long-term trend lasting from several months to several years. This trend can be an uptrend (bull market) or a downtrend (bear market).
Secondary Trend: Intermediate trend that lasts from a few weeks to a few months. It often acts as a correction or consolidation within the primary trend.
Minor Trend: Short-term trend lasting from a few days to a few weeks. These are daily fluctuations in the market.
2. Market Phases
Accumulation Phase: When informed investors start buying, but the general market is still pessimistic.
Public Participation Phase: When the broader market recognizes the trend, leading to widespread buying or selling.
Distribution Phase: When smart investors begin to sell, and the public starts to enter the market, often at the peak.
3. The Averages Must Confirm Each Other
Dow Theory states that for a trend to be considered valid, both the Dow Jones Industrial Average (DJIA) and the Dow Jones Transportation Average (DJTA) must confirm it. For example, if industrials are reaching new highs, transportation stocks should also be reaching new highs to confirm the uptrend.
4. Volume Confirms the Trend
Volume should increase in the direction of the trend. For example, during an uptrend, volume should increase when prices rise and decrease when prices fall.
5. Trends Persist Until a Reversal Occurs
A trend is assumed to remain in place until a definitive signal indicates a reversal. This principle suggests that trends are persistent and will not change direction without substantial evidence.
Dow Theory helps traders and investors understand the broader market trends and make informed decisions based on the interplay between various market indicators.
Let's illustrate Dow Theory with an example using a hypothetical stock market chart. For simplicity, I'll describe how Dow Theory might be applied using various stages of market trends and phases.
Example: Hypothetical Stock XYZ
Primary Trend (Long-Term Trend)
Uptrend: Stock XYZ is in a strong uptrend over several months. The price consistently makes higher highs and higher lows.
Secondary Trend (Intermediate Trend)
Correction: Within the uptrend, XYZ experiences a pullback or consolidation over a few weeks. The price drops but does not break below the previous significant low.
Minor Trend (Short-Term Trend)
Daily Fluctuations: During both the primary uptrend and secondary correction, there are daily price movements, often influenced by market news or short-term factors.
Market Phases
Accumulation: Early in the uptrend, informed investors accumulate shares while the broader market remains skeptical.
Public Participation: As the uptrend gains momentum, more investors notice and start buying.
Distribution: Toward the end of the uptrend, smart investors begin to sell as the public rushes to buy at higher prices.
Averages Must Confirm Each Other
Confirmation: Suppose XYZ is part of an industrial sector, and the transportation index (DJTA) also shows new highs, confirming the strength of the uptrend.
Volume Confirms the Trend
Increasing Volume: During the uptrend, volume increases when prices rise and decreases when prices pull back, confirming the trend's validity.
Trends Persist Until a Reversal Occurs
Reversal Signal: The trend is considered to be intact until a significant reversal signal appears, such as a breach of a major support level or a trendline break.
By observing these elements in the market, traders can use Dow Theory to assess and act on market trends more effectively.
