Quote for the Week
The fact that Black Swans can and do happen in our financial system holds important lessons for how we think about risk. While we look for corroboration of what we believe (confirmation bias), what we really ought to be looking for is the opposite—that observation that would prove us wrong. Sad to relate, we know what is wrong with a lot more confidence than what we know is right. Yet we continue to look ahead with apparent confidence that the past is prologue, based on our assumptions that the probabilities established by history will endure.
The idea of seeking out evidence that contradicts our belief goes far beyond the financial markets. It goes to the very nature of knowledge itself. For the eminent British philosopher Sir Karl Popper—well-known for his use of the Black Swan metaphor—the key question was “what if science didn’t proceed from observation to theory? What if it was the other way around?” Writing in The New Yorker, journalist Adam Gopnik described Popper’s reasoning: “No number of white swans could tell you that all swans were white, but a single black swan could tell you that they weren’t… Science, Popper proposed, didn’t proceed through observations confirmed by verification; it proceeded through wild, overarching conjectures which generalized ‘beyond the data,’ but were always controlled and sharpened by falsification (i.e., proof that the theory was wrong).”
“It was the conscious, purposeful search for falsification by refutation, by the single decisive experiment” (or swan), Popper believed, “that allowed science to proceed and objective knowledge to grow.” Yet most of us—in our investment ideas and political ideas alike—do quite the reverse: we search for facts that confirm our beliefs (reinforcement bias), not for the facts that would negate them. — John Bogle (source)

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