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Another factor that affects whether deals seem valuable is their availability. Somewhat counterintuitively, making promotions more restrictive can actually make them more effective.
Jonah Berger • Contagious: Why Things Catch On

Persuasion: The Practice Of Influence: What Everyone Ought to Know About the Psychology of Persuasion. Become an Influencer without Authority by Understanding the Science and Genetic Code of People
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Pricing Design — A book by Dan Mall
Some of the visitors were first asked an anchoring question, such as, “Would you be willing to pay $5…,” before the point-blank question of how much they would contribute. When no anchor was mentioned, the visitors at the Exploratorium—generally an environmentally sensitive crowd—said they were willing to pay $64, on average. When the anchoring amo
... See moreDaniel Kahneman • Thinking, Fast and Slow
Antes de invitarles a actuar como acompañantes no retribuidos en la excursión al zoo, les pedimos un favor aún mayor: dedicar dos horas a la semana a actuar como orientadores de delincuentes juveniles durante un período mínimo de dos años. Solo después de que rechazaran esta petición extrema –cosa que hicieron todos– les formulamos la petición meno
... See moreRobert B. Cialdini • Influencia. La Psicología De La Persuasión
In the context of the Goldilocks effect, by presenting two ‘extreme’ options next to the option you’re hoping to sell, you can make the middle option appear more attractive or reasonable.
Steven Bartlett • The Diary of a CEO: The 33 Laws of Business and Life

In fact, Harvard ran an experiment showing that people were more likely to let someone cut in line if they only gave a reason.