  An expert tells an advisee whether to take an action that may be good or bad.
He may provide a condition under which to take the action. This condition
predicts whether the action is good if and only if the expert is competent.
Providing the condition exposes the expert to reputational risk by allowing the
advisee to learn about his competence. He trades off the accuracy benefit and
reputational risk induced by providing the condition. He prefers not to provide
it -- i.e., to give "simple advice" -- when his payoff is sufficiently concave
in the posterior belief about his competence.
