Scarcity & Impatience is the Core Drive of wanting something simply because it is extremely rare, exclusive, or immediately unattainable. Many games have Appointment Dynamics or Torture Breaks within them (come back 2 hours later to get your reward) – the fact that people can’t get something right now motivates them to think about it all day long. As a result, they return to the product every chance they get. This drive was well utilized by Facebook when it launched: at first it was just for Harvard students, then it opened up to a few other prestigious schools, and eventually all colleges.
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