Jul 11, 2013
Jul 11, 2013

The Green Lumber Fallacy

Sports knowledge doesn't necessarily transfer to betting

Introducing the Green Lumber Fallacy

Acknowledging & applying risk

The Green Lumber Fallacy

One of the most common mistakes made by aspiring bettors is to confuse specialist sports' knowledge with expertise in sports betting. This error manifests in the proliferation of ex-professional sports stars that become self-proclaimed betting experts, and is neatly described by what Nicholas Nassim Taleb termed  "Green Lumber Fallacy".

One of the most successful traders to ever buy and sell green lumber – which is freshly cut wood – actually had no idea what he was trading. He spent his entire career trading green lumber career believing the product was just wood painted green, and not newly cut trees. His ignorance of the product had no impact on his ability to make money trading it.

The term “Green Lumber Fallacy” was coined by Nassim Nicholas Taleb in his excellent book ‘Antifragile’, where he outlined a second similar situation: a star Swiss Franc trader who’s inability to locate Switzerland on the map didn’t hinder his ability to make money trading its currency.

So how do people ignorant of what they are trading succeed? And how does this apply to betting?

Green Lumber Fallacy applies to betting

Despite their ignorance of the product they trade, the two individuals mentioned above understand the risk associated in trading it. That knowledge is something that those with an intimate knowledge of green lumber or European geography do not possess.

The term “Green Lumber Fallacy” was coined by Nassim Nicholas Taleb in his excellent book ‘Antifragile.’

While knowing about the market and risk is obviously the ideal skillset, it’s vital to remember that understanding risk is as important, if not more so, than knowledge of the sport itself.

This contrasts with the images presented on the back pages of any national newspaper, where you are likely to find retired sports personalities heading tipping columns. It’s understandable that bettors might give weight to the opinion of say an ex-soccer player with regard to betting on soccer, but remember: soccer and betting on soccer are two completely separate domains.

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Acknowledging and applying risk

Taleb may have given the Green Lumber Fallacy its name, but the theory appears elsewhere. For example, Michael Lewis’ highly influential book, Moneyball, centers on the idea that over a century’s collective wisdom of MLB insiders was based on flawed subjective analysis, and in its place a more analytical approach focused on a few fundamental key metrics was more effective.

The Moneyball approach has spread into different sports, including being adopted by several English Premier League managers, challenging the old-school, heavily subjective approach, which is very difficult to quantify and often clouded by confirmation bias.

Practical Takeaways

For any bettors reading this, the following points are important for successful sports betting:

  • Just because someone has detailed knowledge or experience of a sport doesn’t mean they have the required knowledge to bet successfully on that sport.
  • Talking heads/journalists/tipsters love a narrative, a story that neatly explains for example a teams loss of form, and they love even more to back-fit narratives to explain when the story moves in a totally unexpected direction (as is often the case).
  • You should ask this question of yourself – do you think that knowing about golf means you should jump into betting on golf with confidence?

Of course, no one is suggesting sports knowledge is totally irrelevant or valueless for betting on sport, but the narrative in mainstream media is to refer to talking heads as predictive experts, but their domain specialisation, just like with Green Lumber, generally means that they are rarely appropriately placed to be judging risk or make predictions that you should follow with your hard-earned money.

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