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Or suppose that the goal is to increase new purchases of a certain product, such as cell phones or automobiles. A study of a nationally representative sample of more than forty thousand people asked a simple question: Do you intend to buy a new car in the next six months? The very question increased purchase rates by 35 percent.

— Cass Sunstein and Richard Thaler: Nudge: Improving Decisions about Health, Wealth and Happiness

(Source: kindle.amazon.com)