From Michael Santoli in Barrons
IN TALKING TO MARKET PEOPLE OVER THE YEARS, it's clear that the sharper traders and more astute analysts share a couple of traits. The first is to inquire, "What are you hearing?" before they offer their view, and the second is to ask, "Where could I be wrong?" after they do.
The article goes on to discuss "the spirit of challenging the assumptions of the comfortable consensus"; asking the "where could I be wrong?" question is the biggest difference between just programming (getting something to work) and defensive programming (understanding how things fail).
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