Starting with a tiny, easy-to-agree-to request. Once you say "yes" to something small, your brain feels a psychological need to be consistent, making you much more likely to agree to a much larger, more intrusive request later.
An inflated sense of self-importance and a lack of empathy for others. Manipulacion y psicologia oscura - Maria Costan...
Most manipulation studies focus on three specific traits that allow individuals to influence others without guilt: Starting with a tiny, easy-to-agree-to request