Robert Cialdini has observed that, as you are closing a sale, the admission of a downside oddly adds persuasive power: ‘Yes, it is expensive, but you’ll soon find it’s worth it,’ seems to be a strangely persuasive construction – explicitly mentioning a product’s weakness enables people to downplay its importance and accept the trade-off, rather than endlessly worrying about the potential downside. If you are introducing a new product, it might pay to bear this in mind.