The Green Lumber Fallacy / ou, de mal-entendidos

“All that glitters is not gold,” the saying goes. We're often fooled by aesthetics of things into thinking they are the thing. The gist of the Green Lumber Fallacy is this: What works in the real world is not necessarily match our stories of why it works. Unimportant details can often seduce us into thinking we know the reasons for something when we really don't. Only time filters reality from narrative."

"In one of the rare noncharlatanic books in finance, descriptively called What I Learned Losing a Million Dollars, the protagonist makes a big discovery. He remarks that a fellow named Joe Siegel, one of the most successful traders in a commodity called “green lumber,” actually thought it was lumber painted green (rather than freshly cut lumber, called green because it had not been dried). And he made it his profession to trade the stuff! Meanwhile the narrator was into grand intellectual theories and narratives of what caused the price of commodities to move and went bust. It is not just that the successful expert on lumber was ignorant of central matters like the designation “green.” He also knew things about lumber that nonexperts think are unimportant. People we call ignorant might not be ignorant. The fact that predicting the order flow in lumber and the usual narrative had little to do with the details one would assume from the outside are important. People who do things in the field are not subjected to a set exam; they are selected in the most non-narrative manager — nice arguments don't make much difference. Evolution does not rely on narratives, humans do. Evolution does not need a word for the color blue."
Nassim Taleb, Antifragile