Like essentially everything under the sun, our business is bursting with very strong yet varied, sometimes contradictory viewpoints. Ken Fisher hates annuities. John Bogle is committed to passive money management. Dave Ramsey thinks that people should expect 12% annual returns. Eugene Fama says that markets are efficient. Seth Klarman views that as crazy talk.
Intuitively, we tend to believe that we can bridge the gaps between people and ideas using reason and careful analysis. Unfortunately, the evidence suggests that doing so is far harder than we'd like to think. We simply aren't very good at looking at the available evidence for a given viewpoint with any degree of objectivity. Maybe all this has something to do with America's declining math scores, but I think the causes are much more insidious.
While information is cheap and getting cheaper, meaning is increasingly expensive. We are beset by confirmation bias, our tendency to look for and accept evidence that supports what we already think we know and ignore the rest. Per motivated reasoning, we tend to reject new evidence when it contradicts our established beliefs. Sadly, the smarter we are, the more likely we are to deny or oppose data that seem in conflict with ideas we deem important. Finally, bringing true believers together in a group tends only to compound the problem.
Rigged Games
One study by the late Ziva Kunda brought a group of subjects into a lab and told them that they would be playing a trivia game. Before they started, they watched someone else (the "Winner") play, to get the hang of the game. Half the subjects were told that the Winner would be on their team and half were told that the Winner would be on the opposing team. The game they watched was rigged and the Winner answered every question correctly.
When asked about the Winner's success, those who expected to play with the Winner were extremely impressed while those who expected to play against the Winner were dismissive. They attributed the good performance to luck rather than skill (self-serving bias, anyone?). Thus the exact same event receives diametrically opposed interpretations depending upon whose side you're on.
Because of our bias blindness, we all tend to think that even though these sorts of foibles are real that they only apply to others. Thus, for example, a 2006 study found that doctors are poor judges of their own performance. We inevitably draft ourselves onto clans of various sorts and generally deem our side right and the other sides wrong. Getting past that tendency in our personal and professional lives is really hard (to say the least).
Medical Problems
In medicine, perverse incentives are at work pushing people in the wrong direction (and I shouldn't need to add that we have pervasive perverse incentives at work in our business too). Indeed, even when a course of action undertaken by a well-trained professional has been conclusively shown to be in error, the professionals don't tend to change their approaches, especially when there is money involved. Some of that is due to the sorts of biases I have outlined above, but a certain causality illusion is at work too.
We readily acknowledge that correlation does not necessarily imply causation. That's why advertising in our industry carefully states something like "past performance is not indicative of future results." But our brains are wired for us to make the connection we carefully deny. A recent study examined how an illusion of causality influences the way we process new information and found that this illusion both cements bad ideas in our minds and prevents new information from correcting them.
