One of the key findings they drew on was introduced by psychologist Robert Cialdini in his business classic Influence: The Psychology of Persuasion. In a number of studies he references, it was discovered that once people take an action, no matter how small, as long as the experience wasn’t onerous, they are more inclined to take any action in the future. The explanation for this, he says, is that they have made a form of psychological commitment by taking the action, and people have a bias for honoring commitments with subsequent, follow-on actions, often regardless of the change in size of
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