Archive for December 23rd, 2009

Be Careful Of False Theories

Airlines do much better when oil prices fall.  This is a common theory that makes sense on the surface.  After, airlines buy a ton of fuel to run those planes all over the country and world.  When oil prices are high, consumers don’t travel that much.  This all sounds logical.  The problem is you can’t buy or sell airline stocks based on these facts.  In 2009, oil is up over 66%.  If some of these theories were correct, the airline index would be down.  But, it’s not.  Airlines are up over 32% as a basket.

In fact, the chart below is comparing oil and the airlines and their respective correlation.  For most of 2009, there has been a pretty significant POSITIVE correlation, not negative.


Even gold and the dollar which have been moving completely opposite of each other this year don’t always do this.  Before you make an investment decision based on theories, go test them to make sure they hold up over time.


December 2009
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