Liz Truss was spot-on in arguing that the only way in which a state can flourish is by combining low taxes with economic growth. But she failed to persuade her audience that she knew how this could be achieved. If only Dr Kwarteng, a classicist, had drawn her attention to Aristotle’s Art of Rhetoric (4th century bc), the first full analysis of the means of persuasion, the day and her career would have been saved.
First, Aristotle defined two general types of persuasive proof.
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