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Robert Prechter Dispels 10 Popular Investment Myths, Part VII
The world's foremost Elliott wave practitioner tests economists' "Claim #6: 'Wars are bullish/bearish for stock prices.'”

By Vadim Pokhlebkin
Wed, 22 Dec 2010 10:30:00 ET
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This is Part VII of the series "Robert Prechter Dispels 10 Popular Investment Myths," where EWI president explains why traditional financial models failed -- and why they are doomed to fail again (and again). (Excerpted from Prechter's February and March 2010 Elliott Wave Theorists.)

Here are Part I, Part II, Part III, Part IV, Part V and Part VI; come back next week for Part VIII.
 

The Socionomic Theory of Finance
The Conventional Error of Exogenous Cause and Rational Reaction
By Robert Prechter
 
... If the stock market is not reflecting macroeconomic realities, what else could it possibly be doing? Well, how about political news? Maybe political events trump macroeconomic events.
 
Testing Exogenous-Cause Relationships from Political Events
 
It is common for economists to offer a forecast for the stock market yet add a caveat to the effect that “If a war shock or terrorist attack occurs, then I would have to modify my outlook.” For such statements to have any validity, there must be a relationship between war, peace and terrorist attacks on the one hand and the stock market on the other. Surely, since economists say these things, we can assume that they must have access to a study showing that such events affect the stock market, right?
 
The answer is no, for the same reason that they do not check relationships between interest rates, oil prices or the trade balance and the stock market. The causality just seems too sensible to doubt.
 
Claim #6: “Wars are bullish/bearish for stock prices.”
 
Observe in the form of this claim that you have a choice for the outcome of the event. Recall my point that you can argue either side of an exogenous-cause case. Economists have in fact argued both sides of this one. Some have held that war stimulates the economy, because the government spends money furiously and induces companies to gear up for production of war materials. Makes sense. Others have argued that war hurts the economy because it diverts resources from productive enterprise, not to mention that is usually ends up destroying cities, factories and capital goods. Hmm; that makes sense, too. Apparently the way that a war would change an economist’s stock-market outlook depends upon which version of the exogenous-cause argument he believes.
 
I will not take sides here. We can negate both cases just by looking at a few charts. Figure 11 shows a time of war when stock values rose, then fell.
 
 
Figure 12 shows a time of war when stock values fell, then rose.
 
 
Figure 13 shows a time when stock values rose throughout.
 
 
Figure 14 shows a time when stock values fell throughout.
 
Who wins the war seems to mean little, either. A group of Allies won World War I as stock values reached 14-year lows; and nearly the same group of Allies won World War II as stock values neared 14-year highs. Given such conflicting relationships, why and how, exactly, does an economist expect war to affect his economic forecasts?
 
 

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Tags: Bear market, bull market, Efficient Market Hypothesis (EMH), Elliott Wave Principle, fundamental analysis, Robert Prechter, Random Walk Theory, social mood, socionomics
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