So by extension, it's probably fair to say intelligent people are more inclined to trust other people, because they understand distrust is intrinsically costly.
Just finished reading the essay, and one of his points about professors struck a chord with my personal experience back in college. It always felt like the classes that seem to offer the least "financial return" in the real world (i.e. theology, philosophy, or some obscure liberal arts subject) usually end up to be the ones with better qualified and more enthusiastic professors.
To me, an ethical decision is one in which the result does not, and will not, put an individual, or a group of people, at an obvious disadvantage, while benefitting another.