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Skill-vs.-Luck Investing Has Risky Effects

NEW YORK (TheStreet) -- TheStreet.com alum Barry Ritholtz recently shared a post from investment manager Bob Seawright that explored the difference between skill and luck when to comes to investing. Seawright invoked something called the Wyatt Earp effect where Earp famously survived countless gunfights and while history looks back at Earp as having been very skilled, luck also had to play a very large role.

Seawright continues that Bill Miller's streak of beating the S&P 500 for 15 years in a row as he managed the Legg Mason Value Trust (LMVRX) was by Miller's own account "an accident of the calendar."

Understanding the difference between skill and luck is crucial. When a long, lucky streak is confused with skill it can lead to overconfidence which can then lead to increased risk taking. In managing the Legg Mason Value Trust Miller took big risks despite the above quote attributed to him by Seawright.

He had very large positions financial stocks including Fannie Mae and Freddie Mac going into the financial crisis which he did not sell causing his fund to fare far worse with a 73% drop compared to the S&P 500's 56% decline.

Overconfidence is a behavior that repeats in stock market history. One recent anecdotal example came during the Internet bubble and subsequent tech wreck. As high-flying internet stocks rose, legions of day trading shops were opened around the country so that newly minted traders could quit their regular jobs and easily click their way to wealth as internet stocks kept growing to the sky.

What many thought was easily acquired day trading skill turned out to be luck that soon went bad ultimately leading the first 50% decline of the preceding decade.

Recent signs of similar overconfidence could include 3-D printing stocks. Like the internet, 3-D printing is likely to be life changing. Going into mid-November 3D Systems (DDD - Get Report) was up 120% and ExOne (XONE - Get Report) was up 120% from its IPO in February. Both stocks were hit very hard last week; DDD was down 9% and XONE was down 14%.

XONE is down 25% from its high this summer but that did not dissuade Voxeljet (VJET - Get Report) from its IPO one month ago. After rocketing to a 106% gain in just 18 trading days, it then fell 47% from its high last week.

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