Dow Theory: One of the Oldest and Most Reliable Ways to Forecast Market Direction
Charles Dow was the editor of The Wall Street Journal around the beginning of the 20th century. He provided a framework to study the stock market that became known as the Dow Theory.
What Is Dow Theory?
Dow created the Dow Jones Industrial Average and the Dow Jones Transportation Average in the late 1800s to help track the economy. He later found that he could use these as an economic forecasting tool to make money trading stocks. The method: When both indices are moving in the same direction, a confirmed trend is in place. That serves as a signal for traders to become more aggressive.
Dow Theory is based on the premise that the economy grows when manufacturers are producing as much as possible. Economic growth translates into profits for the companies. And this can be seen in the performance of their stocks. Getting goods to market requires the transportation industry to be growing. And that should drive the stocks of transport companies higher.
How Traders Use It
Traders use Dow Theory to identify the direction of the major trend in the stock market. Movements in the two averages must confirm each other to show a trend change.
To signal a bull market, both averages must rise above their most recent highs. A bear market signal is when both averages drop below their most recent lows. A move to a new high or low by just one of the averages is not a trading signal.
Dow ignored the smaller moves in the stock market. His goal was spotting only the primary trends that could last for months, not the short-term trends that unfold over the course of a few days. We can see an example of this in the chart below. When the stock market bottomed in March 2009, Dow Theory did not issue a buy signal until July of that year.
Why It Matters To Traders
This buy signal was about 35% above the low. Traders missed out on significant gains, but still enjoyed more than 30% upside over the next year. As this example shows, Dow Theory signals will always be late. But it also gives traders a much higher degree of confidence.
Although Dow wrote about his theory from 1900 to 1902, the ideas still work today. Dow Theory signals continue to highlight major stock market moves. The system’s rules work well for trend followers who are comfortable missing the first part of a big move in favor of solid confirmation that a trend is in place.
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