Speaking as a shortish, youngish-looking man with a thin face, I'm keenly interested in an explanation for these biases that obliterates their logic. Unfortunately for my purposes, follow-up studies on the link between height and income have found another variable in play, which is intelligence: People who are notably taller than their peers around the age of 16 also tend to be smarter. Similarly, there is some evidence that men with big heads are biologically predisposed to the sort of bullishness that makes them effective negotiators when they're surrounded by pencil-necks.