Elliott Waves -- The Delphic Oracle Approach to Investing

I am amused by the interest in Elliott Waves, particularly with respect to foreign exchange rates. The adherents of this nonsense are enamored with the possibility of discovering trends through systematic waves in charts of essentially anything. The arguments against are the same as rational people use in many circumstances. For example,

1) If true, this analysis would be self-defeating once discovered. If everybody could make money following the pattern, everybody would anticipate the pattern, destroying the pattern.

2) If true, then the practitioners would not be blogging about it. They would be sitting on the beach in the Bahamas, soaking up the sun. The exchange rate between the Euro and the US Dollar (known as EURUSD to the cognoscenti) has jumped so much in six months that anyone who could use Elliott Waves to predict the trend would now be rich. Many of these people appear not to be rich.

3) If true, there would be no reason, discarding the possibility of altruism, for anyone to spread the word for peanuts. You would not have people selling books or DVDs for $19.95, for Elliott Waves any more than making money from home for a small price, available at the address on your TV screen.

4) Correlation is not causation. It's a common error to try to fit a straight line through a graph of two variables and then discover a causal relationship. It is less often done with respect to wavy patterns, because they are so much more difficult to quantify. But mathematicians know that you can approximate any regular pattern with a series based on sine waves. If you allow enough slop, you can do this with a modest number of them.

History examines the past and offers explanations. It's interesting, but won't make you rich. Science examines the past through experiments and predicts future behavior. The Elliott Wave folks think they have science, but they just have history. Maybe not bunk, but close.