As many of you know, I was one of the earliest proponents of applying behavioral finance to the universe of investing and the galaxy of retirement plans in particular. As early as the mid-1990’s, when it was still considered the black sheep of various economics and finance departments, I lauded it. The common sense reality of behavioral economics led us out of the incomprehensible maze that had become Modern Portfolio Theory (“MPT”). The purveyors of MPT had allowed the Theory to be placed on an altar of infallibility. When investors failed to live up to MPT, it was the investors’ fault, not MPT’s fault.

Behavioral finance changed that. It suggested any investment theory must account for and accommodate the (sometimes flawed) reality of human (i.e., irrational) decision making. In effect, it allowed us to embrace the perverse notion that people make irrational decisions in a perfectly consistent and often predictable fashion. It may sound silly, but it works. It explains why people who pay a dollar to commit to attending a “free” luncheon are more likely to attend that luncheon than some who merely signed up and paid nothing. (It also explains why people who literally “sign” up are more likely to attend than people who just say they’re going to attend.)

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