There are few economists smarter than Bryan Caplan, whose efforts to apply economic analysis to political phenomena have produced breakthrough insights, none more than his pioneering Myth of the Rational Voter (2007). But higher authorities also command deference. Aristotle is one. He warned in Book II of his Politics that political life is not reducible to an economic problem. Caplan’s recent post at Law and Liberty’s sister publication, EconLog, illustrates why.